diff --git a/docs/features.md b/docs/features.md
index 4a6a4e6..5291f77 100644
--- a/docs/features.md
+++ b/docs/features.md
@@ -3,6 +3,13 @@
 ## Location Coverage
 - **Three-level region tree**: Vietnam → nine provinces → 75 districts and towns,
   generated into `src/data/regions/` and traversed through `src/lib/regions.js`
+- **Names shown in Vietnamese**: every province and district carries an
+  accented `nameVi` ("Hoàn Kiếm", "Quận 7"), derived by the boundary script
+  from its OSM query, and `regionName()` in `src/lib/regions.js` is what the
+  interface, the API's `region.name` and the share text show. The ASCII `name`
+  stays as the stable form for codes, logs and search aliases; the map search
+  matches either spelling. The country stays "Vietnam" in an English
+  interface. The font loads the `vietnamese` subset for the glyphs
 - **Play at any level**: the whole country, one province, or one district
 - **Pre-2025-merger boundaries**: Da Lat sits under Lam Dong, Duc Hoa under Long An
 - **Partial by design**: see the Coverage note in [project-overview.md](project-overview.md)
diff --git a/docs/project-overview.md b/docs/project-overview.md
index bc0d20e..6623df3 100644
--- a/docs/project-overview.md
+++ b/docs/project-overview.md
@@ -40,6 +40,9 @@ Tau, which is not what people mean by the city. Two consequences to remember:
 
 ## Coverage
 
+Region names in these docs are the ASCII `name`; players see the accented
+`nameVi` (see Location Coverage in [features.md](features.md)).
+
 Nine provinces — Ha Noi, Ho Chi Minh, Da Nang, Lam Dong, Long An, Dong Nai,
 Binh Duong, Thanh Hoa, Quang Nam — split into 75 districts and towns. Coverage
 is deliberately partial and will grow in future releases.
diff --git a/scripts/build-region-boundaries.mjs b/scripts/build-region-boundaries.mjs
index 2d408d4..f2c5ce6 100644
--- a/scripts/build-region-boundaries.mjs
+++ b/scripts/build-region-boundaries.mjs
@@ -57,6 +57,9 @@ const LEAF_TOLERANCE = 0.0001; // ~11m
 //   center    Optional override. The computed centre of mass of an irregular
 //             outline can land somewhere no one associates with the place, so
 //             the five original entry points keep their hand-picked centres.
+//   nameVi    The accented Vietnamese name, shown to players. Provinces state
+//             it; a leaf's is derived from its query (see vietnameseName) and
+//             only needs stating where the derivation would mislead.
 //
 // To add a province: add its node and its leaves here, run this script, then
 // scripts/build-pano-index.mjs and scripts/assign-pano-districts.mjs. No
@@ -68,7 +71,7 @@ const REGIONS = {
 
   // -- Ha Noi ---------------------------------------------------------------
   // Not merged in 2025, but split here into its 30 pre-2025 units.
-  HN: { name: 'Ha Noi', level: 'province', parent: 'VN', center: [21.0285, 105.8542], legacyBbox: [105.28896, 20.56452, 106.02004, 21.38542] },
+  HN: { name: 'Ha Noi', nameVi: 'Hà Nội', level: 'province', parent: 'VN', center: [21.0285, 105.8542], legacyBbox: [105.28896, 20.56452, 106.02004, 21.38542] },
   'HN-BADINH': { name: 'Ba Dinh', level: 'district', parent: 'HN', query: 'Quận Ba Đình, Hà Nội, Việt Nam' },
   'HN-HOANKIEM': { name: 'Hoan Kiem', level: 'district', parent: 'HN', query: 'Quận Hoàn Kiếm, Hà Nội, Việt Nam' },
   'HN-TAYHO': { name: 'Tay Ho', level: 'district', parent: 'HN', query: 'Quận Tây Hồ, Hà Nội, Việt Nam' },
@@ -102,7 +105,7 @@ const REGIONS = {
 
   // -- Ho Chi Minh ----------------------------------------------------------
   // Districts 2 and 9 are absent on purpose: both merged into Thu Duc in 2021.
-  TPHCM: { name: 'Ho Chi Minh', level: 'province', parent: 'VN', center: [10.8231, 106.6297], legacyBbox: [106.46356, 10.35828, 107.02758, 10.92934] },
+  TPHCM: { name: 'Ho Chi Minh', nameVi: 'Hồ Chí Minh', level: 'province', parent: 'VN', center: [10.8231, 106.6297], legacyBbox: [106.46356, 10.35828, 107.02758, 10.92934] },
   'TPHCM-Q1': { name: 'District 1', level: 'district', parent: 'TPHCM', query: 'Quận 1, Thành phố Hồ Chí Minh, Việt Nam' },
   'TPHCM-Q3': { name: 'District 3', level: 'district', parent: 'TPHCM', query: 'Quận 3, Thành phố Hồ Chí Minh, Việt Nam' },
   'TPHCM-Q4': { name: 'District 4', level: 'district', parent: 'TPHCM', query: 'Quận 4, Thành phố Hồ Chí Minh, Việt Nam' },
@@ -132,7 +135,7 @@ const REGIONS = {
   // -- Da Nang --------------------------------------------------------------
   // Hoang Sa is administratively part of Da Nang but is a disputed offshore
   // island group with no street imagery, so it is deliberately left out.
-  DN: { name: 'Da Nang', level: 'province', parent: 'VN', center: [16.0544, 108.2022], legacyBbox: [107.81854, 15.91799, 108.33864, 16.2255] },
+  DN: { name: 'Da Nang', nameVi: 'Đà Nẵng', level: 'province', parent: 'VN', center: [16.0544, 108.2022], legacyBbox: [107.81854, 15.91799, 108.33864, 16.2255] },
   'DN-HAICHAU': { name: 'Hai Chau', level: 'district', parent: 'DN', query: 'Quận Hải Châu, Đà Nẵng, Việt Nam' },
   'DN-THANHKHE': { name: 'Thanh Khe', level: 'district', parent: 'DN', query: 'Quận Thanh Khê, Đà Nẵng, Việt Nam' },
   'DN-SONTRA': { name: 'Son Tra', level: 'district', parent: 'DN', query: 'Quận Sơn Trà, Đà Nẵng, Việt Nam' },
@@ -144,14 +147,14 @@ const REGIONS = {
   // -- Lam Dong / Long An ---------------------------------------------------
   // DL and DH keep bare codes because their leaderboard keys already exist
   // under those names. Every leaf added since is prefixed with its province.
-  LD: { name: 'Lam Dong', level: 'province', parent: 'VN', partialCoverage: 'one town covered', legacyBbox: [108.31521, 11.80798, 108.5944, 12.00855] },
+  LD: { name: 'Lam Dong', nameVi: 'Lâm Đồng', level: 'province', parent: 'VN', partialCoverage: 'one town covered', legacyBbox: [108.31521, 11.80798, 108.5944, 12.00855] },
   DL: { name: 'Da Lat', level: 'district', parent: 'LD', query: 'Thành phố Đà Lạt, Việt Nam', center: [11.9404, 108.4583] },
 
   // Long An covers three of its districts now, so legacyBbox is the whole
   // pre-2025 province rather than the extent of Duc Hoa alone -- a leaf
   // lookup is rejected when its centre falls outside the parent box, and
   // Ben Luc and Can Giuoc both sit well south of Duc Hoa.
-  LA: { name: 'Long An', level: 'province', parent: 'VN', partialCoverage: 'three districts covered', legacyBbox: [105.45, 10.35, 106.85, 11.1] },
+  LA: { name: 'Long An', nameVi: 'Long An', level: 'province', parent: 'VN', partialCoverage: 'three districts covered', legacyBbox: [105.45, 10.35, 106.85, 11.1] },
   DH: { name: 'Duc Hoa', level: 'district', parent: 'LA', query: 'Đức Hòa, Việt Nam', center: [10.8888, 106.3825] },
   'LA-BENLUC': { name: 'Ben Luc', level: 'district', parent: 'LA', query: 'Bến Lức, Việt Nam' },
   'LA-CANGIUOC': { name: 'Can Giuoc', level: 'district', parent: 'LA', query: 'Cần Giuộc, Việt Nam' },
@@ -159,7 +162,7 @@ const REGIONS = {
   // -- Dong Nai -------------------------------------------------------------
   // Code DNA, not DN: Da Nang holds that one. Long Khanh is left out -- its
   // panoramas fall in only two 1.1km cells, one short of playable.
-  DNA: { name: 'Dong Nai', level: 'province', parent: 'VN', partialCoverage: 'six districts covered', legacyBbox: [106.6, 10.45, 107.85, 11.6] },
+  DNA: { name: 'Dong Nai', nameVi: 'Đồng Nai', level: 'province', parent: 'VN', partialCoverage: 'six districts covered', legacyBbox: [106.6, 10.45, 107.85, 11.6] },
   'DNA-BIENHOA': { name: 'Bien Hoa', level: 'district', parent: 'DNA', query: 'Thành phố Biên Hòa, Đồng Nai, Việt Nam' },
   'DNA-NHONTRACH': { name: 'Nhon Trach', level: 'district', parent: 'DNA', query: 'Nhơn Trạch, Đồng Nai, Việt Nam' },
   'DNA-LONGTHANH': { name: 'Long Thanh', level: 'district', parent: 'DNA', query: 'Long Thành, Đồng Nai, Việt Nam' },
@@ -171,7 +174,7 @@ const REGIONS = {
   // Ben Cat is deliberately absent despite having coverage: its imagery was
   // captured in 2016, and a decade-old streetscape makes a worse round than
   // no round at all.
-  BD: { name: 'Binh Duong', level: 'province', parent: 'VN', partialCoverage: 'three cities covered', legacyBbox: [106.35, 10.85, 107.2, 11.85] },
+  BD: { name: 'Binh Duong', nameVi: 'Bình Dương', level: 'province', parent: 'VN', partialCoverage: 'three cities covered', legacyBbox: [106.35, 10.85, 107.2, 11.85] },
   'BD-DIAN': { name: 'Di An', level: 'district', parent: 'BD', query: 'Dĩ An, Việt Nam' },
   'BD-THUANAN': { name: 'Thuan An', level: 'district', parent: 'BD', query: 'Thuận An, Việt Nam' },
   'BD-THUDAUMOT': { name: 'Thu Dau Mot', level: 'district', parent: 'BD', query: 'Thủ Dầu Một, Việt Nam' },
@@ -180,11 +183,11 @@ const REGIONS = {
   // Two provinces carried by a couple of towns each, the same shape as Lam
   // Dong. Both are here for variety: everything else added alongside them is
   // the industrial ring around Ho Chi Minh City, which all looks alike.
-  TH: { name: 'Thanh Hoa', level: 'province', parent: 'VN', partialCoverage: 'two towns covered', legacyBbox: [104.35, 19.3, 106.1, 20.65] },
-  'TH-THANHHOA': { name: 'Thanh Hoa City', level: 'district', parent: 'TH', query: 'Thành phố Thanh Hóa, Thanh Hóa, Việt Nam' },
+  TH: { name: 'Thanh Hoa', nameVi: 'Thanh Hóa', level: 'province', parent: 'VN', partialCoverage: 'two towns covered', legacyBbox: [104.35, 19.3, 106.1, 20.65] },
+  'TH-THANHHOA': { name: 'Thanh Hoa City', nameVi: 'TP. Thanh Hóa', level: 'district', parent: 'TH', query: 'Thành phố Thanh Hóa, Thanh Hóa, Việt Nam' },
   'TH-SAMSON': { name: 'Sam Son', level: 'district', parent: 'TH', query: 'Sầm Sơn, Thanh Hóa, Việt Nam' },
 
-  QNA: { name: 'Quang Nam', level: 'province', parent: 'VN', partialCoverage: 'one town covered', legacyBbox: [107.1, 14.9, 108.75, 16.2] },
+  QNA: { name: 'Quang Nam', nameVi: 'Quảng Nam', level: 'province', parent: 'VN', partialCoverage: 'one town covered', legacyBbox: [107.1, 14.9, 108.75, 16.2] },
   'QNA-HOIAN': { name: 'Hoi An', level: 'district', parent: 'QNA', query: 'Hội An, Việt Nam' },
 };
 
@@ -463,6 +466,24 @@ function writeBoundaryBarrel() {
  * writer. src/lib/regions.js joins the two.
  * @param {Object} resolvedState Per-code resolution info.
  */
+/**
+ * The accented Vietnamese name of a node, for display.
+ *
+ * Leaves carry it inside their Nominatim query: "Quận Hoàn Kiếm, Hà Nội, Việt
+ * Nam" names the place as "Hoàn Kiếm" once the administrative type is dropped.
+ * The type stays when the rest is only a number ("Quận 7"), because that IS the
+ * name. The country has none: it is "Vietnam" in an English interface.
+ * @param {Object} config A REGIONS entry.
+ * @returns {string|undefined}
+ */
+function vietnameseName(config) {
+  if (config.nameVi) return config.nameVi;
+  if (!config.query) return undefined;
+  const head = config.query.split(',')[0].trim();
+  const stripped = head.replace(/^(?:Quận|Huyện|Thị xã|Thành phố)\s+/u, '');
+  return /^\d+$/.test(stripped) ? head : stripped;
+}
+
 function writeTree(resolvedState) {
   const nodes = Object.entries(REGIONS).map(([code, config]) => {
     const state = resolvedState[code] ?? {};
@@ -473,6 +494,8 @@ function writeTree(resolvedState) {
       level: config.level,
       children: childrenOf(code),
     };
+    const nameVi = vietnameseName(config);
+    if (nameVi) node.nameVi = nameVi;
     if (state.center) node.center = state.center;
     if (state.bbox) node.bbox = state.bbox;
     if (config.partialCoverage) node.partialCoverage = config.partialCoverage;
diff --git a/src/app/components/GameClient.js b/src/app/components/GameClient.js
index 19b62a4..1050ddc 100644
--- a/src/app/components/GameClient.js
+++ b/src/app/components/GameClient.js
@@ -18,7 +18,7 @@ import { playSound } from '../../lib/audio';
 // The revealed path comes from /api/guess (the RESOLVED district), not from
 // regionPath(pickedRegion) -- computing it client-side from what the player
 // chose would make the reveal meaningless for a country round.
-import { getRegion, isRegion } from '../../lib/regions';
+import { getRegion, isRegion, regionName as regionNameOf } from '../../lib/regions';
 import { dailyDay } from '../../lib/daily-calendar';
 import { getDailyProgress, saveDailyResult, currentStreak } from '../../lib/daily-progress';
 
@@ -135,7 +135,7 @@ export default function GameClient({ region, daily = false }) {
   // than the load-bearing check it used to be when the code came from a query
   // string this component read itself.
   const pickedRegion = isRegion(region) ? getRegion(region) : null;
-  const regionName = pickedRegion ? pickedRegion.name : 'Vietnam';
+  const regionName = pickedRegion ? regionNameOf(pickedRegion.code) : 'Vietnam';
 
   const initializingRef = useRef(false);
   // The next round, fetched while the result dialog is open so Next Round can
diff --git a/src/app/components/LeaderboardModal.js b/src/app/components/LeaderboardModal.js
index dbd6f85..c6c0612 100644
--- a/src/app/components/LeaderboardModal.js
+++ b/src/app/components/LeaderboardModal.js
@@ -6,7 +6,7 @@ import { Button } from '@/components/ui/button';
 import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle } from '@/components/ui/dialog';
 import LeaderboardList from './LeaderboardList';
 import RegionSelect from './RegionSelect';
-import { COUNTRY_CODE, getRegion } from '../../lib/regions';
+import { COUNTRY_CODE, regionName } from '../../lib/regions';
 
 // The leaderboard feature: the header trigger button plus the dialog it opens.
 // Owning the button here keeps the open gesture and the cache clear in one
@@ -89,7 +89,7 @@ export default function LeaderboardModal({ currentUsername }) {
         <DialogContent className="sm:max-w-3xl max-h-[85vh] overflow-y-auto">
           <DialogHeader>
             <DialogTitle className="text-2xl text-center font-bold">
-              {region ? getRegion(region).name : 'Leaderboards'}
+              {region ? regionName(region) : 'Leaderboards'}
             </DialogTitle>
             {/* sr-only: the region select and type toggle right below say the
                 same thing visually; Radix still needs a description. */}
diff --git a/src/app/components/RegionPicker.js b/src/app/components/RegionPicker.js
index d86972b..edefe26 100644
--- a/src/app/components/RegionPicker.js
+++ b/src/app/components/RegionPicker.js
@@ -21,6 +21,7 @@ import {
   isUnresolved,
   provinces,
   regionSlug,
+  regionName,
 } from '../../lib/regions';
 
 /** Thousands separators, so 225,966 reads as a quantity rather than a code. */
@@ -106,7 +107,7 @@ function UnavailableRow({ code }) {
     <div
       className="flex min-h-14 items-center justify-between gap-3 rounded-xl border border-dashed border-border/60 p-4 opacity-60"
     >
-      <span className="font-medium text-muted-foreground">{getRegion(code).name}</span>
+      <span className="font-medium text-muted-foreground">{regionName(code)}</span>
       <span className="text-xs text-muted-foreground">{unavailableLabel(code)}</span>
     </div>
   );
@@ -137,7 +138,7 @@ export default function RegionPicker({ onPlayClick }) {
       <PlayRow code={COUNTRY_CODE} label="Play anywhere in Vietnam" emphasis onPlayClick={onPlayClick} />
 
       {lastRegion && (
-        <PlayRow code={lastRegion} label={`Continue in ${getRegion(lastRegion).name}`} onPlayClick={onPlayClick} />
+        <PlayRow code={lastRegion} label={`Continue in ${regionName(lastRegion)}`} onPlayClick={onPlayClick} />
       )}
 
       <Accordion type="multiple" className="grid gap-2">
@@ -154,7 +155,7 @@ export default function RegionPicker({ onPlayClick }) {
             >
               <AccordionTrigger className="hover:no-underline">
                 <span className="flex flex-1 flex-wrap items-center justify-between gap-2 pr-3">
-                  <span className="text-base font-semibold text-foreground">{region.name}</span>
+                  <span className="text-base font-semibold text-foreground">{regionName(province)}</span>
                   <span className="flex items-center gap-2 text-xs text-muted-foreground">
                     {region.partialCoverage && (
                       <span
@@ -171,10 +172,10 @@ export default function RegionPicker({ onPlayClick }) {
               </AccordionTrigger>
 
               <AccordionContent className="grid gap-2">
-                <PlayRow code={province} label={`Play anywhere in ${region.name}`} onPlayClick={onPlayClick} />
+                <PlayRow code={province} label={`Play anywhere in ${regionName(province)}`} onPlayClick={onPlayClick} />
                 {districts.map((district) =>
                   isPlayable(district) ? (
-                    <PlayRow key={district} code={district} label={getRegion(district).name} onPlayClick={onPlayClick} />
+                    <PlayRow key={district} code={district} label={regionName(district)} onPlayClick={onPlayClick} />
                   ) : (
                     <UnavailableRow key={district} code={district} />
                   )
diff --git a/src/app/components/RegionSelect.js b/src/app/components/RegionSelect.js
index 1daf939..5263385 100644
--- a/src/app/components/RegionSelect.js
+++ b/src/app/components/RegionSelect.js
@@ -13,10 +13,10 @@ import {
 import {
   COUNTRY_CODE,
   childrenOf,
-  getRegion,
   isPlayable,
   isThin,
   provinces,
+  regionName,
 } from '../../lib/regions';
 
 const LEVELS = [
@@ -70,7 +70,7 @@ export default function RegionSelect({
     }
     return provinces()
       .map((province) => ({
-        label: getRegion(province).name,
+        label: regionName(province),
         codes: childrenOf(province).filter((code) => !playableOnly || isPlayable(code)),
       }))
       .filter((group) => group.codes.length > 0);
@@ -120,7 +120,7 @@ export default function RegionSelect({
                 {group.label && <SelectLabel>{group.label}</SelectLabel>}
                 {group.codes.map((code) => (
                   <SelectItem key={code} value={code}>
-                    {getRegion(code).name}
+                    {regionName(code)}
                     {isThin(code) ? ' · few streets' : ''}
                   </SelectItem>
                 ))}
diff --git a/src/app/game/[region]/page.js b/src/app/game/[region]/page.js
index d5ffd2b..fa94064 100644
--- a/src/app/game/[region]/page.js
+++ b/src/app/game/[region]/page.js
@@ -2,8 +2,8 @@ import { notFound } from 'next/navigation';
 import GameClient from '../../components/GameClient';
 import {
   allRegions,
-  getRegion,
   regionFromSlug,
+  regionName,
   regionPath,
   regionSlug,
 } from '../../../lib/regions';
@@ -43,7 +43,7 @@ export async function generateMetadata({ params }) {
 
   if (!code) return {};
 
-  const { name } = getRegion(code);
+  const name = regionName(code);
   // Narrowest first, country dropped: 'Ba Dinh, Ha Noi' rather than
   // 'Vietnam, Ha Noi, Ba Dinh' -- regionPath returns outermost first, so this
   // reverses it, and the country is the same word on all 85.
diff --git a/src/app/layout.js b/src/app/layout.js
index 3e56b11..3348199 100644
--- a/src/app/layout.js
+++ b/src/app/layout.js
@@ -8,14 +8,16 @@ import { SpeedInsights } from '@vercel/speed-insights/next';
 import { Geist, Geist_Mono } from "next/font/google";
 import "./globals.css";
 
+// Region names are shown in accented Vietnamese, so the font has to ship the
+// Vietnamese glyphs or every "Hà Nội" falls back to the system face.
 const geistSans = Geist({
   variable: "--font-geist-sans",
-  subsets: ["latin"],
+  subsets: ["latin", "vietnamese"],
 });
 
 const geistMono = Geist_Mono({
   variable: "--font-geist-mono",
-  subsets: ["latin"],
+  subsets: ["latin", "vietnamese"],
 });
 
 // Deployment URL for absolute Open Graph URLs. Vercel sets the production
diff --git a/src/data/regions/index.js b/src/data/regions/index.js
index 26fed5e..b7f4a88 100644
--- a/src/data/regions/index.js
+++ b/src/data/regions/index.js
@@ -8,88 +8,88 @@
 
 export const REGIONS = {
   "VN": {"code":"VN","name":"Vietnam","parent":null,"level":"country","children":["HN","TPHCM","DN","LD","LA","DNA","BD","TH","QNA"],"center":[15.8718,106.99349],"bbox":[105.28896,10.35818,108.69802,21.38542]},
-  "HN": {"code":"HN","name":"Ha Noi","parent":"VN","level":"province","children":["HN-BADINH","HN-HOANKIEM","HN-TAYHO","HN-LONGBIEN","HN-CAUGIAY","HN-DONGDA","HN-HAIBATRUNG","HN-HOANGMAI","HN-THANHXUAN","HN-BACTULIEM","HN-NAMTULIEM","HN-HADONG","HN-SONTAY","HN-BAVI","HN-CHUONGMY","HN-DANPHUONG","HN-DONGANH","HN-GIALAM","HN-HOAIDUC","HN-MELINH","HN-MYDUC","HN-PHUXUYEN","HN-PHUCTHO","HN-QUOCOAI","HN-SOCSON","HN-THACHTHAT","HN-THANHOAI","HN-THANHTRI","HN-THUONGTIN","HN-UNGHOA"],"center":[21.0285,105.8542],"bbox":[105.28896,20.56452,106.02004,21.38542]},
-  "HN-BADINH": {"code":"HN-BADINH","name":"Ba Dinh","parent":"HN","level":"district","children":[],"center":[21.03578,105.826],"bbox":[105.80135,21.01596,105.85597,21.05337]},
-  "HN-HOANKIEM": {"code":"HN-HOANKIEM","name":"Hoan Kiem","parent":"HN","level":"district","children":[],"center":[21.02901,105.85378],"bbox":[105.84093,21.01813,105.86728,21.04321]},
-  "HN-TAYHO": {"code":"HN-TAYHO","name":"Tay Ho","parent":"HN","level":"district","children":[],"center":[21.06931,105.81988],"bbox":[105.79178,21.03951,105.84828,21.09737]},
-  "HN-LONGBIEN": {"code":"HN-LONGBIEN","name":"Long Bien","parent":"HN","level":"district","children":[],"center":[21.04246,105.89397],"bbox":[105.84106,20.99411,105.93877,21.08081]},
-  "HN-CAUGIAY": {"code":"HN-CAUGIAY","name":"Cau Giay","parent":"HN","level":"district","children":[],"center":[21.0306,105.79168],"bbox":[105.76716,21.00066,105.81352,21.05879]},
-  "HN-DONGDA": {"code":"HN-DONGDA","name":"Dong Da","parent":"HN","level":"district","children":[],"center":[21.01547,105.82503],"bbox":[105.79763,20.99742,105.84263,21.03215]},
-  "HN-HAIBATRUNG": {"code":"HN-HAIBATRUNG","name":"Hai Ba Trung","parent":"HN","level":"district","children":[],"center":[21.00564,105.8585],"bbox":[105.8409,20.98996,105.88241,21.02127]},
-  "HN-HOANGMAI": {"code":"HN-HOANGMAI","name":"Hoang Mai","parent":"HN","level":"district","children":[],"center":[20.97454,105.86322],"bbox":[105.80739,20.94544,105.90879,21.00376]},
-  "HN-THANHXUAN": {"code":"HN-THANHXUAN","name":"Thanh Xuan","parent":"HN","level":"district","children":[],"center":[20.99482,105.81531],"bbox":[105.79218,20.98056,105.84287,21.00885]},
-  "HN-BACTULIEM": {"code":"HN-BACTULIEM","name":"Bac Tu Liem","parent":"HN","level":"district","children":[],"center":[21.07198,105.7613],"bbox":[105.71721,21.03798,105.80499,21.10812]},
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+  "HN-HOAIDUC": {"code":"HN-HOAIDUC","name":"Hoai Duc","parent":"HN","level":"district","children":[],"nameVi":"Hoài Đức","center":[21.02405,105.69946],"bbox":[105.64615,20.95542,105.74275,21.09028]},
+  "HN-MELINH": {"code":"HN-MELINH","name":"Me Linh","parent":"HN","level":"district","children":[],"nameVi":"Mê Linh","center":[21.18352,105.7058],"bbox":[105.61499,21.12176,105.7909,21.23963]},
+  "HN-MYDUC": {"code":"HN-MYDUC","name":"My Duc","parent":"HN","level":"district","children":[],"nameVi":"Mỹ Đức","center":[20.68678,105.72026],"bbox":[105.64768,20.56452,105.81286,20.82997]},
+  "HN-PHUXUYEN": {"code":"HN-PHUXUYEN","name":"Phu Xuyen","parent":"HN","level":"district","children":[],"nameVi":"Phú Xuyên","center":[20.73559,105.90112],"bbox":[105.7918,20.65079,106.00392,20.80684]},
+  "HN-PHUCTHO": {"code":"HN-PHUCTHO","name":"Phuc Tho","parent":"HN","level":"district","children":[],"nameVi":"Phúc Thọ","center":[21.11707,105.58374],"bbox":[105.50053,21.04026,105.66491,21.17912]},
+  "HN-QUOCOAI": {"code":"HN-QUOCOAI","name":"Quoc Oai","parent":"HN","level":"district","children":[],"nameVi":"Quốc Oai","center":[20.96769,105.59765],"bbox":[105.4782,20.90939,105.72589,21.04616]},
+  "HN-SOCSON": {"code":"HN-SOCSON","name":"Soc Son","parent":"HN","level":"district","children":[],"nameVi":"Sóc Sơn","center":[21.27256,105.83045],"bbox":[105.72329,21.17692,105.93902,21.38542]},
+  "HN-THACHTHAT": {"code":"HN-THACHTHAT","name":"Thach That","parent":"HN","level":"district","children":[],"nameVi":"Thạch Thất","center":[21.01894,105.53016],"bbox":[105.39192,20.94573,105.63988,21.10199]},
+  "HN-THANHOAI": {"code":"HN-THANHOAI","name":"Thanh Oai","parent":"HN","level":"district","children":[],"nameVi":"Thanh Oai","center":[20.85577,105.78086],"bbox":[105.72512,20.78033,105.84123,20.93973]},
+  "HN-THANHTRI": {"code":"HN-THANHTRI","name":"Thanh Tri","parent":"HN","level":"district","children":[],"nameVi":"Thanh Trì","center":[20.93266,105.84089],"bbox":[105.78821,20.89699,105.91311,20.98653]},
+  "HN-THUONGTIN": {"code":"HN-THUONGTIN","name":"Thuong Tin","parent":"HN","level":"district","children":[],"nameVi":"Thường Tín","center":[20.84497,105.87482],"bbox":[105.81267,20.75192,105.93617,20.91223]},
+  "HN-UNGHOA": {"code":"HN-UNGHOA","name":"Ung Hoa","parent":"HN","level":"district","children":[],"nameVi":"Ứng Hòa","center":[20.7119,105.79932],"bbox":[105.69662,20.61188,105.90562,20.80969]},
+  "TPHCM": {"code":"TPHCM","name":"Ho Chi Minh","parent":"VN","level":"province","children":["TPHCM-Q1","TPHCM-Q3","TPHCM-Q4","TPHCM-Q5","TPHCM-Q6","TPHCM-Q7","TPHCM-Q8","TPHCM-Q10","TPHCM-Q11","TPHCM-Q12","TPHCM-BINHTAN","TPHCM-BINHTHANH","TPHCM-GOVAP","TPHCM-PHUNHUAN","TPHCM-TANBINH","TPHCM-TANPHU","TPHCM-THUDUC","TPHCM-BINHCHANH","TPHCM-CANGIO","TPHCM-CUCHI","TPHCM-HOCMON","TPHCM-NHABE"],"nameVi":"Hồ Chí Minh","center":[10.8231,106.6297],"bbox":[106.46356,10.35818,107.02767,10.92934],"missingParts":1},
+  "TPHCM-Q1": {"code":"TPHCM-Q1","name":"District 1","parent":"TPHCM","level":"district","children":[],"nameVi":"Quận 1","center":[10.77622,106.69715],"bbox":[106.68169,10.75352,106.7152,10.79693]},
+  "TPHCM-Q3": {"code":"TPHCM-Q3","name":"District 3","parent":"TPHCM","level":"district","children":[],"nameVi":"Quận 3","center":[10.78146,106.68284],"bbox":[106.66429,10.76543,106.69813,10.79251]},
+  "TPHCM-Q4": {"code":"TPHCM-Q4","name":"District 4","parent":"TPHCM","level":"district","children":[],"nameVi":"Quận 4","center":[10.75846,106.70554],"bbox":[106.68642,10.75171,106.72228,10.76976]},
+  "TPHCM-Q5": {"code":"TPHCM-Q5","name":"District 5","parent":"TPHCM","level":"district","children":[],"nameVi":"Quận 5","center":[10.75494,106.66946],"bbox":[106.65051,10.74614,106.68727,10.76543]},
+  "TPHCM-Q6": {"code":"TPHCM-Q6","name":"District 6","parent":"TPHCM","level":"district","children":[],"nameVi":"Quận 6","center":[10.74587,106.63524],"bbox":[106.62108,10.72973,106.65505,10.76202]},
+  "TPHCM-Q7": {"code":"TPHCM-Q7","name":"District 7","parent":"TPHCM","level":"district","children":[],"nameVi":"Quận 7","center":[10.73646,106.72962],"bbox":[106.69009,10.69795,106.76866,10.77763]},
+  "TPHCM-Q8": {"code":"TPHCM-Q8","name":"District 8","parent":"TPHCM","level":"district","children":[],"nameVi":"Quận 8","center":[10.7245,106.64055],"bbox":[106.59456,10.68985,106.69285,10.75211]},
+  "TPHCM-Q10": {"code":"TPHCM-Q10","name":"District 10","parent":"TPHCM","level":"district","children":[],"nameVi":"Quận 10","center":[10.77237,106.66826],"bbox":[106.65613,10.75843,106.6828,10.78693]},
+  "TPHCM-Q11": {"code":"TPHCM-Q11","name":"District 11","parent":"TPHCM","level":"district","children":[],"nameVi":"Quận 11","center":[10.76412,106.64773],"bbox":[106.6342,10.7534,106.66156,10.77845]},
+  "TPHCM-Q12": {"code":"TPHCM-Q12","name":"District 12","parent":"TPHCM","level":"district","children":[],"nameVi":"Quận 12","center":[10.86453,106.65697],"bbox":[106.60328,10.81861,106.7182,10.9042]},
+  "TPHCM-BINHTAN": {"code":"TPHCM-BINHTAN","name":"Binh Tan","parent":"TPHCM","level":"district","children":[],"nameVi":"Bình Tân","center":[10.76473,106.59754],"bbox":[106.55831,10.71096,106.62526,10.82978]},
+  "TPHCM-BINHTHANH": {"code":"TPHCM-BINHTHANH","name":"Binh Thanh","parent":"TPHCM","level":"district","children":[],"nameVi":"Bình Thạnh","center":[10.81206,106.7162],"bbox":[106.68385,10.78534,106.75139,10.83917]},
+  "TPHCM-GOVAP": {"code":"TPHCM-GOVAP","name":"Go Vap","parent":"TPHCM","level":"district","children":[],"nameVi":"Gò Vấp","center":[10.8383,106.66741],"bbox":[106.63194,10.80997,106.70106,10.86079]},
+  "TPHCM-PHUNHUAN": {"code":"TPHCM-PHUNHUAN","name":"Phu Nhuan","parent":"TPHCM","level":"district","children":[],"nameVi":"Phú Nhuận","center":[10.80033,106.67817],"bbox":[106.66596,10.78791,106.69248,10.81414]},
+  "TPHCM-TANBINH": {"code":"TPHCM-TANBINH","name":"Tan Binh","parent":"TPHCM","level":"district","children":[],"nameVi":"Tân Bình","center":[10.80882,106.65239],"bbox":[106.62789,10.76891,106.67861,10.83725]},
+  "TPHCM-TANPHU": {"code":"TPHCM-TANPHU","name":"Tan Phu","parent":"TPHCM","level":"district","children":[],"nameVi":"Tân Phú","center":[10.79255,106.62689],"bbox":[106.6074,10.75817,106.64768,10.82469]},
+  "TPHCM-THUDUC": {"code":"TPHCM-THUDUC","name":"Thu Duc","parent":"TPHCM","level":"district","children":[],"nameVi":"Thủ Đức","center":[10.82035,106.78951],"bbox":[106.69783,10.74212,106.88176,10.89885]},
+  "TPHCM-BINHCHANH": {"code":"TPHCM-BINHCHANH","name":"Binh Chanh","parent":"TPHCM","level":"district","children":[],"nameVi":"Bình Chánh","center":[10.73382,106.57587],"bbox":[106.46356,10.62531,106.69495,10.87364]},
+  "TPHCM-CANGIO": {"code":"TPHCM-CANGIO","name":"Can Gio","parent":"TPHCM","level":"district","children":[],"nameVi":"Cần Giờ","center":[10.51704,106.881],"bbox":[106.73846,10.35818,107.02767,10.67427]},
+  "TPHCM-CUCHI": {"code":"TPHCM-CUCHI","name":"Cu Chi","parent":"TPHCM","level":"district","children":[],"nameVi":"Củ Chi","coverage":"unresolved"},
+  "TPHCM-HOCMON": {"code":"TPHCM-HOCMON","name":"Hoc Mon","parent":"TPHCM","level":"district","children":[],"nameVi":"Hóc Môn","center":[10.88585,106.58983],"bbox":[106.49562,10.8261,106.69279,10.92934]},
+  "TPHCM-NHABE": {"code":"TPHCM-NHABE","name":"Nha Be","parent":"TPHCM","level":"district","children":[],"nameVi":"Nhà Bè","center":[10.6543,106.73051],"bbox":[106.67328,10.57636,106.78373,10.72563]},
+  "DN": {"code":"DN","name":"Da Nang","parent":"VN","level":"province","children":["DN-HAICHAU","DN-THANHKHE","DN-SONTRA","DN-NGUHANHSON","DN-LIENCHIEU","DN-CAMLE","DN-HOAVANG"],"nameVi":"Đà Nẵng","center":[16.0544,108.2022],"bbox":[107.81854,15.91799,108.33864,16.22576]},
+  "DN-HAICHAU": {"code":"DN-HAICHAU","name":"Hai Chau","parent":"DN","level":"district","children":[],"nameVi":"Hải Châu","center":[16.05669,108.21143],"bbox":[108.18883,16.02131,108.236,16.10365]},
+  "DN-THANHKHE": {"code":"DN-THANHKHE","name":"Thanh Khe","parent":"DN","level":"district","children":[],"nameVi":"Thanh Khê","center":[16.06315,108.19039],"bbox":[108.16378,16.02637,108.21456,16.08084]},
+  "DN-SONTRA": {"code":"DN-SONTRA","name":"Son Tra","parent":"DN","level":"district","children":[],"nameVi":"Sơn Trà","center":[16.11094,108.26514],"bbox":[108.20903,16.05099,108.33864,16.15565]},
+  "DN-NGUHANHSON": {"code":"DN-NGUHANHSON","name":"Ngu Hanh Son","parent":"DN","level":"district","children":[],"nameVi":"Ngũ Hành Sơn","center":[15.99755,108.25003],"bbox":[108.21683,15.95597,108.28957,16.05675]},
+  "DN-LIENCHIEU": {"code":"DN-LIENCHIEU","name":"Lien Chieu","parent":"DN","level":"district","children":[],"nameVi":"Liên Chiểu","center":[16.13388,108.14835],"bbox":[108.08699,16.0331,108.21061,16.22576]},
+  "DN-CAMLE": {"code":"DN-CAMLE","name":"Cam Le","parent":"DN","level":"district","children":[],"nameVi":"Cẩm Lệ","center":[16.01409,108.19606],"bbox":[108.15769,15.97164,108.23951,16.06188]},
+  "DN-HOAVANG": {"code":"DN-HOAVANG","name":"Hoa Vang","parent":"DN","level":"district","children":[],"nameVi":"Hòa Vang","center":[16.06583,108.01436],"bbox":[107.81854,15.91799,108.22494,16.21544]},
+  "LD": {"code":"LD","name":"Lam Dong","parent":"VN","level":"province","children":["DL"],"nameVi":"Lâm Đồng","center":[11.92055,108.4644],"bbox":[108.31521,11.80798,108.59461,12.00855],"partialCoverage":"one town covered"},
+  "DL": {"code":"DL","name":"Da Lat","parent":"LD","level":"district","children":[],"nameVi":"Đà Lạt","center":[11.9404,108.4583],"bbox":[108.31521,11.80798,108.59461,12.00855]},
+  "LA": {"code":"LA","name":"Long An","parent":"VN","level":"province","children":["DH","LA-BENLUC","LA-CANGIUOC"],"nameVi":"Long An","center":[10.77014,106.48428],"bbox":[106.27082,10.57389,106.73324,11.02578],"partialCoverage":"three districts covered"},
+  "DH": {"code":"DH","name":"Duc Hoa","parent":"LA","level":"district","children":[],"nameVi":"Đức Hòa","center":[10.8888,106.3825],"bbox":[106.27082,10.7409,106.53287,11.02578]},
+  "LA-BENLUC": {"code":"LA-BENLUC","name":"Ben Luc","parent":"LA","level":"district","children":[],"nameVi":"Bến Lức","center":[10.69188,106.45105],"bbox":[106.33144,10.58941,106.56008,10.79766]},
+  "LA-CANGIUOC": {"code":"LA-CANGIUOC","name":"Can Giuoc","parent":"LA","level":"district","children":[],"nameVi":"Cần Giuộc","center":[10.61496,106.68721],"bbox":[106.63494,10.57389,106.73324,10.65666]},
+  "DNA": {"code":"DNA","name":"Dong Nai","parent":"VN","level":"province","children":["DNA-BIENHOA","DNA-NHONTRACH","DNA-LONGTHANH","DNA-TRANGBOM","DNA-VINHCUU","DNA-THONGNHAT"],"nameVi":"Đồng Nai","center":[11.03911,107.02893],"bbox":[106.76197,10.64365,107.25919,11.51163],"partialCoverage":"six districts covered"},
+  "DNA-BIENHOA": {"code":"DNA-BIENHOA","name":"Bien Hoa","parent":"DNA","level":"district","children":[],"nameVi":"Biên Hòa","center":[10.91804,106.88104],"bbox":[106.76197,10.8225,106.98711,11.00586]},
+  "DNA-NHONTRACH": {"code":"DNA-NHONTRACH","name":"Nhon Trach","parent":"DNA","level":"district","children":[],"nameVi":"Nhơn Trạch","center":[10.73706,106.89264],"bbox":[106.82559,10.68785,106.96365,10.78522]},
+  "DNA-LONGTHANH": {"code":"DNA-LONGTHANH","name":"Long Thanh","parent":"DNA","level":"district","children":[],"nameVi":"Long Thành","center":[10.76537,107.02319],"bbox":[106.86427,10.64365,107.1463,10.87903]},
+  "DNA-TRANGBOM": {"code":"DNA-TRANGBOM","name":"Trang Bom","parent":"DNA","level":"district","children":[],"nameVi":"Trảng Bom","center":[10.96923,107.03504],"bbox":[106.90356,10.85913,107.12883,11.10274]},
+  "DNA-VINHCUU": {"code":"DNA-VINHCUU","name":"Vinh Cuu","parent":"DNA","level":"district","children":[],"nameVi":"Vĩnh Cửu","center":[11.23874,107.04996],"bbox":[106.77447,10.97383,107.23242,11.51163]},
+  "DNA-THONGNHAT": {"code":"DNA-THONGNHAT","name":"Thong Nhat","parent":"DNA","level":"district","children":[],"nameVi":"Thống Nhất","center":[10.99013,107.15468],"bbox":[107.05891,10.8488,107.25919,11.10027]},
+  "BD": {"code":"BD","name":"Binh Duong","parent":"VN","level":"province","children":["BD-DIAN","BD-THUANAN","BD-THUDAUMOT"],"nameVi":"Bình Dương","center":[10.92921,106.7089],"bbox":[106.6298,10.86348,106.79462,10.99723],"partialCoverage":"three cities covered"},
+  "BD-DIAN": {"code":"BD-DIAN","name":"Di An","parent":"BD","level":"district","children":[],"nameVi":"Dĩ An","center":[10.90191,106.75607],"bbox":[106.73418,10.86348,106.79462,10.93726]},
+  "BD-THUANAN": {"code":"BD-THUANAN","name":"Thuan An","parent":"BD","level":"district","children":[],"nameVi":"Thuận An","center":[10.9418,106.67865],"bbox":[106.6502,10.9208,106.7073,10.9636]},
+  "BD-THUDAUMOT": {"code":"BD-THUDAUMOT","name":"Thu Dau Mot","parent":"BD","level":"district","children":[],"nameVi":"Thủ Dầu Một","center":[10.9701,106.6585],"bbox":[106.6298,10.93972,106.68926,10.99723]},
+  "TH": {"code":"TH","name":"Thanh Hoa","parent":"VN","level":"province","children":["TH-THANHHOA","TH-SAMSON"],"nameVi":"Thanh Hóa","center":[19.79405,105.7771],"bbox":[105.64736,19.6996,105.93343,19.88351],"partialCoverage":"two towns covered"},
+  "TH-THANHHOA": {"code":"TH-THANHHOA","name":"Thanh Hoa City","parent":"TH","level":"district","children":[],"nameVi":"TP. Thanh Hóa","center":[19.80359,105.7578],"bbox":[105.64736,19.72713,105.86242,19.88351]},
+  "TH-SAMSON": {"code":"TH-SAMSON","name":"Sam Son","parent":"TH","level":"district","children":[],"nameVi":"Sầm Sơn","center":[19.74492,105.87647],"bbox":[105.81954,19.6996,105.93343,19.78598]},
+  "QNA": {"code":"QNA","name":"Quang Nam","parent":"VN","level":"province","children":["QNA-HOIAN"],"nameVi":"Quảng Nam","center":[15.89237,108.47816],"bbox":[108.28964,15.81121,108.69802,15.98104],"partialCoverage":"one town covered"},
+  "QNA-HOIAN": {"code":"QNA-HOIAN","name":"Hoi An","parent":"QNA","level":"district","children":[],"nameVi":"Hội An","center":[15.89237,108.47816],"bbox":[108.28964,15.81121,108.69802,15.98104]},
 };
diff --git a/src/lib/geo-search.js b/src/lib/geo-search.js
index 4b95acd..e996609 100644
--- a/src/lib/geo-search.js
+++ b/src/lib/geo-search.js
@@ -7,7 +7,7 @@
 // test in tests/geo-search.test.js enforces that this module never grows a
 // path to pano-index.js, pano-db.js, or the boundary barrel.
 
-import { allRegions, getRegion, ancestorsOf, COUNTRY_CODE } from './regions.js';
+import { allRegions, getRegion, ancestorsOf, COUNTRY_CODE, regionName } from './regions.js';
 
 export const PHOTON_ENDPOINT = 'https://photon.komoot.io/api';
 
@@ -42,7 +42,9 @@ const ADMIN_PREFIX = /^(?:quan|q\.?|huyen|h\.?|phuong|p\.?|district|thi xa|tx\.?
  * @returns {string[]} Folded keys.
  */
 export function regionSearchKeys(region) {
-  const aliases = [foldDiacritics(region.name)];
+  // Both spellings: the ASCII name a foreign player types and the accented
+  // Vietnamese one a local does, each folded so diacritics never matter.
+  const aliases = [...new Set([region.name, region.nameVi].filter(Boolean).map(foldDiacritics))];
   const districtNumber = aliases[0].match(/^district (\d+)$/);
   if (districtNumber) {
     aliases.push(`quan ${districtNumber[1]}`, `q ${districtNumber[1]}`);
@@ -92,13 +94,13 @@ export function searchRegions(query, rootCode) {
   }
 
   return scored
-    .sort((a, b) => a.rank - b.rank || a.region.name.localeCompare(b.region.name))
+    .sort((a, b) => a.rank - b.rank || regionName(a.region.code).localeCompare(regionName(b.region.code)))
     .slice(0, 5)
     .map(({ region }) => ({
       kind: 'region',
-      label: region.name,
+      label: regionName(region.code),
       sublabel: region.parent && region.parent !== COUNTRY_CODE
-        ? getRegion(region.parent).name
+        ? regionName(region.parent)
         : 'Province',
       center: region.center ?? null,
       bbox: region.bbox ?? null,
diff --git a/src/lib/region-request.js b/src/lib/region-request.js
index bd5bac3..3ccbddd 100644
--- a/src/lib/region-request.js
+++ b/src/lib/region-request.js
@@ -4,7 +4,7 @@
 // or defaulting slightly differently is how a typo becomes a leaderboard key
 // nobody reads.
 
-import { getRegion, isRegion, isPlayable, regionPath, COUNTRY_CODE } from './regions.js';
+import { getRegion, isRegion, isPlayable, regionPath, COUNTRY_CODE, regionName } from './regions.js';
 
 /**
  * A 400-shaped failure a route can return directly.
@@ -56,7 +56,7 @@ export function resolvePlayableRegion(searchParams) {
   if (!resolved.ok) return resolved;
 
   if (!isPlayable(resolved.code)) {
-    return reject(`${getRegion(resolved.code).name} has no street view coverage yet`);
+    return reject(`${regionName(resolved.code)} has no street view coverage yet`);
   }
   return resolved;
 }
@@ -74,7 +74,7 @@ export function publicRegion(code) {
   const region = getRegion(code);
   return {
     code,
-    name: region.name,
+    name: regionName(code),
     path: regionPath(code),
     level: region.level,
   };
diff --git a/src/lib/regions.js b/src/lib/regions.js
index 776ea00..05f6b1b 100644
--- a/src/lib/regions.js
+++ b/src/lib/regions.js
@@ -35,6 +35,20 @@ export function isRegion(code) {
   return Boolean(code && REGIONS[code]);
 }
 
+/**
+ * The name to show a player: the accented Vietnamese form where the tree has
+ * one, else the ASCII `name`. Places are named the way they are written where
+ * they are -- "Hoàn Kiếm", not "Hoan Kiem" -- and the country stays "Vietnam"
+ * because the rest of the interface is English. `name` remains the stable
+ * ASCII form for search aliases and logs.
+ * @param {string} code Region code.
+ * @returns {string}
+ */
+export function regionName(code) {
+  const region = getRegion(code);
+  return region.nameVi ?? region.name;
+}
+
 /**
  * The URL path segment for a region: `/game/tphcm-q7`.
  *
@@ -148,7 +162,7 @@ export function provinces() {
 export function regionPath(code) {
   return ancestorsOf(code)
     .reverse()
-    .map((c) => getRegion(c).name);
+    .map((c) => regionName(c));
 }
 
 /** Every node in the tree, in declaration order. */
diff --git a/tests/e2e/audio.spec.js b/tests/e2e/audio.spec.js
index 8df8610..d82c452 100644
--- a/tests/e2e/audio.spec.js
+++ b/tests/e2e/audio.spec.js
@@ -73,7 +73,7 @@ for (const width of [320, 360]) {
   test(`game header fits a ${width}px viewport`, async ({ page }) => {
     await page.setViewportSize({ width, height: 720 });
     await page.goto('/game/tphcm');
-    await expect(page.getByText('Ho Chi Minh', { exact: true })).toBeVisible();
+    await expect(page.getByText('Hồ Chí Minh', { exact: true })).toBeVisible();
 
     // One combined switch, not the pair: the pair is display:none here, which
     // also keeps it out of the accessibility tree.
@@ -90,7 +90,7 @@ for (const width of [320, 360]) {
 test('mutes everything from the compact switch on a phone', async ({ page }) => {
   await page.setViewportSize({ width: 360, height: 720 });
   await page.goto('/game/tphcm');
-  await expect(page.getByText('Ho Chi Minh', { exact: true })).toBeVisible();
+  await expect(page.getByText('Hồ Chí Minh', { exact: true })).toBeVisible();
 
   const mute = page.getByRole('button', { name: 'Sound', exact: true });
   await expect(mute).toHaveAttribute('aria-pressed', 'true');
@@ -116,7 +116,7 @@ test('plays on with audio files missing', async ({ page }) => {
   page.on('pageerror', (error) => errors.push(error.message));
 
   await page.goto('/game/tphcm');
-  await expect(page.getByText('Ho Chi Minh', { exact: true })).toBeVisible();
+  await expect(page.getByText('Hồ Chí Minh', { exact: true })).toBeVisible();
 
   // Effects stay ON here: muting them is what made an earlier version of this
   // test exercise only the music path.
@@ -139,7 +139,7 @@ test('plays on with audio files missing', async ({ page }) => {
 test('keeps both header variants in step across the breakpoint', async ({ page }) => {
   await page.setViewportSize({ width: 360, height: 720 });
   await page.goto('/game/tphcm');
-  await expect(page.getByText('Ho Chi Minh', { exact: true })).toBeVisible();
+  await expect(page.getByText('Hồ Chí Minh', { exact: true })).toBeVisible();
 
   await page.getByRole('button', { name: 'Sound', exact: true }).click();
 
diff --git a/tests/e2e/game.spec.js b/tests/e2e/game.spec.js
index d154fac..4db9cd6 100644
--- a/tests/e2e/game.spec.js
+++ b/tests/e2e/game.spec.js
@@ -16,7 +16,7 @@ test.beforeEach(async ({ page }) => {
 
 test('plays a round to the reveal and into the next one', async ({ page }) => {
   // Round loaded: header badge names the picked region, viewer container is up.
-  await expect(page.getByText('Ho Chi Minh', { exact: true })).toBeVisible();
+  await expect(page.getByText('Hồ Chí Minh', { exact: true })).toBeVisible();
 
   // No guess yet: the submit button says so and is disabled.
   const submit = page.getByRole('button', { name: /Place a guess first/ });
@@ -42,7 +42,7 @@ test('plays a round to the reveal and into the next one', async ({ page }) => {
   await expect(dialog).toBeVisible();
   // exact: the sr-only dialog description ("... 123m away.") also contains it.
   await expect(dialog.getByText('123m away', { exact: true })).toBeVisible();
-  await expect(dialog.getByText('Vietnam › Ho Chi Minh › District 7')).toBeVisible();
+  await expect(dialog.getByText('Vietnam › Hồ Chí Minh › Quận 7')).toBeVisible();
 
   // The bookkeeping lives behind a collapsed "Leaderboard results" section so
   // the payoff fits one viewport; open it before asserting its contents.
@@ -50,7 +50,7 @@ test('plays a round to the reveal and into the next one', async ({ page }) => {
   // The scoring ladder, with the achieved band present.
   await expect(dialog.getByText('≤200m = 3')).toBeVisible();
   await expect(dialog.getByText('Score added at 3 levels (+3, +3, +3)')).toBeVisible();
-  await expect(dialog.getByText('District 7', { exact: true })).toBeVisible();
+  await expect(dialog.getByText('Quận 7', { exact: true })).toBeVisible();
 
   // Next round resets to a fresh, unguessed state and swaps in a new image.
   await dialog.getByRole('button', { name: 'Next Round' }).click();
diff --git a/tests/e2e/helpers.js b/tests/e2e/helpers.js
index 37d86fc..3b3d156 100644
--- a/tests/e2e/helpers.js
+++ b/tests/e2e/helpers.js
@@ -27,8 +27,8 @@ export function newGameResponse(sessionId, round) {
     sessionId,
     region: {
       code: 'TPHCM',
-      name: 'Ho Chi Minh',
-      path: ['Vietnam', 'Ho Chi Minh'],
+      name: 'Hồ Chí Minh',
+      path: ['Vietnam', 'Hồ Chí Minh'],
       level: 'province',
     },
     // A distinct URL per round, as in production (the session id is NOT the
@@ -38,7 +38,7 @@ export function newGameResponse(sessionId, round) {
   };
 }
 
-/** /api/guess response: a 123m round on a TPHCM pick, revealed as District 7. */
+/** /api/guess response: a 123m round on a TPHCM pick, revealed as Quận 7. */
 export function guessResponse(username) {
   // `points` is what this round added at that level; `score` is the
   // accumulated total. Values mirror the real route: 123m is 3 points on the
@@ -52,19 +52,19 @@ export function guessResponse(username) {
       distance: 123,
       score: 3,
       levels: [
-        scoreLevel('TPHCM-Q7', 'District 7', 1, 3),
-        scoreLevel('TPHCM', 'Ho Chi Minh', 2, 3),
+        scoreLevel('TPHCM-Q7', 'Quận 7', 1, 3),
+        scoreLevel('TPHCM', 'Hồ Chí Minh', 2, 3),
         scoreLevel('VN', 'Vietnam', 5, 3),
       ],
       distanceLevels: [
-        distanceLevel('TPHCM-Q7', 'District 7', 1),
-        distanceLevel('TPHCM', 'Ho Chi Minh', 3),
+        distanceLevel('TPHCM-Q7', 'Quận 7', 1),
+        distanceLevel('TPHCM', 'Hồ Chí Minh', 3),
         distanceLevel('VN', 'Vietnam', 9),
       ],
       region: {
         code: 'TPHCM-Q7',
-        name: 'District 7',
-        path: ['Vietnam', 'Ho Chi Minh', 'District 7'],
+        name: 'Quận 7',
+        path: ['Vietnam', 'Hồ Chí Minh', 'Quận 7'],
         level: 'district',
       },
       globalRank: 5,
diff --git a/tests/e2e/home.spec.js b/tests/e2e/home.spec.js
index ade97ea..8f4b28e 100644
--- a/tests/e2e/home.spec.js
+++ b/tests/e2e/home.spec.js
@@ -13,15 +13,15 @@ test.beforeEach(async ({ page }) => {
 
 test('offers the country and every province', async ({ page }) => {
   await expect(page.getByRole('link', { name: /Play anywhere in Vietnam/ })).toBeVisible();
-  for (const province of ['Ha Noi', 'Ho Chi Minh', 'Da Nang', 'Lam Dong', 'Long An']) {
+  for (const province of ['Ha Noi', 'Hồ Chí Minh', 'Da Nang', 'Lam Dong', 'Long An']) {
     await expect(page.getByRole('button', { name: new RegExp(province) })).toBeVisible();
   }
 });
 
 test('expands a province to playable district links', async ({ page }) => {
-  await page.getByRole('button', { name: /Ho Chi Minh/ }).click();
-  await expect(page.getByRole('link', { name: /Play anywhere in Ho Chi Minh/ })).toBeVisible();
-  const district7 = page.getByRole('link', { name: /District 7/ });
+  await page.getByRole('button', { name: /Hồ Chí Minh/ }).click();
+  await expect(page.getByRole('link', { name: /Play anywhere in Hồ Chí Minh/ })).toBeVisible();
+  const district7 = page.getByRole('link', { name: /Quận 7/ });
   await expect(district7).toBeVisible();
   await expect(district7).toHaveAttribute('href', '/game/tphcm-q7');
 });
@@ -29,10 +29,10 @@ test('expands a province to playable district links', async ({ page }) => {
 test('lists an uncovered district as disabled, with the reason', async ({ page }) => {
   // Cu Chi has no OSM boundary left; it must be shown, not hidden, and carry
   // no game link.
-  await page.getByRole('button', { name: /Ho Chi Minh/ }).click();
-  const row = page.locator('div', { hasText: /^Cu Chino map data$/ }).last();
+  await page.getByRole('button', { name: /Hồ Chí Minh/ }).click();
+  const row = page.locator('div', { hasText: /^Củ Chino map data$/ }).last();
   await expect(row).toBeVisible();
-  await expect(page.getByRole('link', { name: /^Cu Chi$/ })).toHaveCount(0);
+  await expect(page.getByRole('link', { name: /^Củ Chi$/ })).toHaveCount(0);
 });
 
 test('shows the build commit in the debug footer and copies it on click', async ({ page, context }) => {
diff --git a/tests/e2e/routing.spec.js b/tests/e2e/routing.spec.js
index 3602abe..858097b 100644
--- a/tests/e2e/routing.spec.js
+++ b/tests/e2e/routing.spec.js
@@ -34,7 +34,7 @@ test('serves the canonical region URL without redirecting', async ({ page }) =>
   expect(response.status()).toBe(200);
   expect(landedAt(page)).toBe('/game/tphcm');
   // Landed on a real round, not an error panel.
-  await expect(page.getByText('Ho Chi Minh', { exact: true })).toBeVisible();
+  await expect(page.getByText('Hồ Chí Minh', { exact: true })).toBeVisible();
 });
 
 test('redirects the legacy ?region= form', async ({ page }) => {
@@ -74,7 +74,7 @@ test('serves an uppercase URL directly, without redirecting', async ({ page }) =
   const response = await page.goto('/game/TPHCM');
   expect(response.status()).toBe(200);
   expect(landedAt(page)).toBe('/game/TPHCM');
-  await expect(page.getByText('Ho Chi Minh', { exact: true })).toBeVisible();
+  await expect(page.getByText('Hồ Chí Minh', { exact: true })).toBeVisible();
 });
 
 test('lowercases an uppercase legacy region in one hop', async ({ page }) => {
diff --git a/tests/geo-search.test.js b/tests/geo-search.test.js
index 6246ba5..ada19a9 100644
--- a/tests/geo-search.test.js
+++ b/tests/geo-search.test.js
@@ -36,15 +36,15 @@ describe('regionSearchKeys', () => {
 
 describe('searchRegions', () => {
   it('matches Vietnamese admin phrasing against the tree names', () => {
-    expect(searchRegions('quận 7', 'TPHCM')[0].label).toBe('District 7');
-    expect(searchRegions('q7', 'TPHCM')[0].label).toBe('District 7');
-    expect(searchRegions('hoàn kiếm', 'VN')[0].label).toBe('Hoan Kiem');
-    expect(searchRegions('huyện Hóc Môn', 'VN')[0].label).toBe('Hoc Mon');
+    expect(searchRegions('quận 7', 'TPHCM')[0].label).toBe('Quận 7');
+    expect(searchRegions('q7', 'TPHCM')[0].label).toBe('Quận 7');
+    expect(searchRegions('hoàn kiếm', 'VN')[0].label).toBe('Hoàn Kiếm');
+    expect(searchRegions('huyện Hóc Môn', 'VN')[0].label).toBe('Hóc Môn');
   });
 
   it('scopes results to the played region', () => {
     expect(searchRegions('district 1', 'HN')).toEqual([]);
-    expect(searchRegions('tay ho', 'HN')[0].label).toBe('Tay Ho');
+    expect(searchRegions('tay ho', 'HN')[0].label).toBe('Tây Hồ');
   });
 
   it('returns nothing for junk or too-short queries', () => {
diff --git a/tests/guess-route.test.js b/tests/guess-route.test.js
index 373ea1a..7fb9bea 100644
--- a/tests/guess-route.test.js
+++ b/tests/guess-route.test.js
@@ -82,7 +82,7 @@ describe('POST /api/guess', () => {
     const body = await (
       await guess({ username: 'mai', sessionId: 's3', guessLat: HCMC.lat, guessLng: HCMC.lng })
     ).json();
-    expect(body.gameResult.region.path).toEqual(['Vietnam', 'Ho Chi Minh', 'District 7']);
+    expect(body.gameResult.region.path).toEqual(['Vietnam', 'Hồ Chí Minh', 'Quận 7']);
   });
 
   it('cannot be replayed for double credit', async () => {
diff --git a/tests/new-game-route.test.js b/tests/new-game-route.test.js
index 3147c93..13ee52c 100644
--- a/tests/new-game-route.test.js
+++ b/tests/new-game-route.test.js
@@ -115,7 +115,7 @@ describe('GET /api/new-game', () => {
   it('rejects a region with no coverage, naming it', async () => {
     const response = await GET(request('region=TPHCM-CUCHI'));
     expect(response.status).toBe(400);
-    expect((await response.json()).error).toMatch(/Cu Chi/);
+    expect((await response.json()).error).toMatch(/Củ Chi/);
   });
 
   it('rejects a missing region', async () => {
diff --git a/tests/region-request.test.js b/tests/region-request.test.js
index 6597ae2..b9c69e2 100644
--- a/tests/region-request.test.js
+++ b/tests/region-request.test.js
@@ -70,8 +70,8 @@ describe('publicRegion', () => {
   it('describes what the player picked', () => {
     expect(publicRegion('TPHCM')).toEqual({
       code: 'TPHCM',
-      name: 'Ho Chi Minh',
-      path: ['Vietnam', 'Ho Chi Minh'],
+      name: 'Hồ Chí Minh',
+      path: ['Vietnam', 'Hồ Chí Minh'],
       level: 'province',
     });
   });
diff --git a/tests/regions.test.js b/tests/regions.test.js
index fc0b1fc..15d17be 100644
--- a/tests/regions.test.js
+++ b/tests/regions.test.js
@@ -134,7 +134,7 @@ describe('ancestry', () => {
   });
 
   it('renders an outermost-first path', () => {
-    expect(regionPath('DL')).toEqual(['Vietnam', 'Lam Dong', 'Da Lat']);
+    expect(regionPath('DL')).toEqual(['Vietnam', 'Lâm Đồng', 'Đà Lạt']);
   });
 
   it('rejects an unknown code with the known ones listed', () => {