diff --git a/docs/CURRENT-STATE.md b/docs/CURRENT-STATE.md
index b615bb70d..fbbaa19b0 100644
--- a/docs/CURRENT-STATE.md
+++ b/docs/CURRENT-STATE.md
@@ -174,7 +174,8 @@ compact anchored photo card. Selection stays pinned across camera, filter and
 sample changes until explicit deselection or layer disable. Its medium image
 uses `object-fit: contain`, with names, compact observed age and creator/licence.
 The card is the single source link to iNaturalist. Obscured sightings also stay
-text-only; Acartia stays text-only with provider credit and whale guidance.
+text-only; Acartia stays text-only with provider credit and whale guidance,
+and its source link is always `https://acartia.io/`, never a contributed URL.
 Placement avoids actual HUD, toolbar and rail rectangles, panning only when
 necessary while preserving zoom. Escape, close or an outside click closes the
 card and clears selection. Camera/layout changes reposition the card without
diff --git a/src/i18n/locales/ar.json b/src/i18n/locales/ar.json
index da291e035..b491c3c93 100644
--- a/src/i18n/locales/ar.json
+++ b/src/i18n/locales/ar.json
@@ -3453,7 +3453,6 @@
   "Loading photo...": "جارٍ تحميل الصورة…",
   "Photo unavailable": "الصورة غير متاحة",
   "Location obscured to a 0.2° cell": "الموقع مخفي ضمن خلية بمقدار 0.2°",
-  "Open on Acartia ↗": "فتح على Acartia ↗",
   "Photo of {name}": "صورة {name}",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",
diff --git a/src/i18n/locales/de.json b/src/i18n/locales/de.json
index 69b039fc5..d01ff292f 100644
--- a/src/i18n/locales/de.json
+++ b/src/i18n/locales/de.json
@@ -3153,7 +3153,6 @@
   "Loading photo...": "Foto wird geladen…",
   "Photo unavailable": "Foto nicht verfügbar",
   "Location obscured to a 0.2° cell": "Standort auf eine 0,2°-Rasterzelle verschleiert",
-  "Open on Acartia ↗": "Auf Acartia öffnen ↗",
   "Photo of {name}": "Foto von {name}",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",
diff --git a/src/i18n/locales/es.json b/src/i18n/locales/es.json
index a34a9bf39..aa403f743 100644
--- a/src/i18n/locales/es.json
+++ b/src/i18n/locales/es.json
@@ -3228,7 +3228,6 @@
   "Loading photo...": "Cargando foto…",
   "Photo unavailable": "Foto no disponible",
   "Location obscured to a 0.2° cell": "Ubicación oculta en una celda de 0,2°",
-  "Open on Acartia ↗": "Abrir en Acartia ↗",
   "Photo of {name}": "Foto de {name}",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",
diff --git a/src/i18n/locales/fr.json b/src/i18n/locales/fr.json
index a09806cfa..b3ae72189 100644
--- a/src/i18n/locales/fr.json
+++ b/src/i18n/locales/fr.json
@@ -3228,7 +3228,6 @@
   "Loading photo...": "Chargement de la photo…",
   "Photo unavailable": "Photo indisponible",
   "Location obscured to a 0.2° cell": "Localisation masquée dans une cellule de 0,2°",
-  "Open on Acartia ↗": "Ouvrir sur Acartia ↗",
   "Photo of {name}": "Photo de {name}",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",
diff --git a/src/i18n/locales/it.json b/src/i18n/locales/it.json
index b800b010c..4c69e1d4c 100644
--- a/src/i18n/locales/it.json
+++ b/src/i18n/locales/it.json
@@ -3228,7 +3228,6 @@
   "Loading photo...": "Caricamento della foto…",
   "Photo unavailable": "Foto non disponibile",
   "Location obscured to a 0.2° cell": "Posizione oscurata in una cella di 0,2°",
-  "Open on Acartia ↗": "Apri su Acartia ↗",
   "Photo of {name}": "Foto di {name}",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",
diff --git a/src/i18n/locales/ja.json b/src/i18n/locales/ja.json
index fbfc9dd96..9a053f869 100644
--- a/src/i18n/locales/ja.json
+++ b/src/i18n/locales/ja.json
@@ -3078,7 +3078,6 @@
   "Loading photo...": "写真を読み込み中…",
   "Photo unavailable": "写真を表示できません",
   "Location obscured to a 0.2° cell": "位置は0.2°のセル内に秘匿されています",
-  "Open on Acartia ↗": "Acartiaで開く ↗",
   "Photo of {name}": "{name}の写真",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",
diff --git a/src/i18n/locales/pt.json b/src/i18n/locales/pt.json
index a57f4eeaf..79c507759 100644
--- a/src/i18n/locales/pt.json
+++ b/src/i18n/locales/pt.json
@@ -3228,7 +3228,6 @@
   "Loading photo...": "Carregando foto…",
   "Photo unavailable": "Foto indisponível",
   "Location obscured to a 0.2° cell": "Localização ocultada em uma célula de 0,2°",
-  "Open on Acartia ↗": "Abrir no Acartia ↗",
   "Photo of {name}": "Foto de {name}",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",
diff --git a/src/i18n/locales/ru.json b/src/i18n/locales/ru.json
index 2946ba482..11fddb3e9 100644
--- a/src/i18n/locales/ru.json
+++ b/src/i18n/locales/ru.json
@@ -3303,7 +3303,6 @@
   "Loading photo...": "Загрузка фото…",
   "Photo unavailable": "Фото недоступно",
   "Location obscured to a 0.2° cell": "Местоположение скрыто в ячейке 0,2°",
-  "Open on Acartia ↗": "Открыть на Acartia ↗",
   "Photo of {name}": "Фото {name}",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",
diff --git a/src/i18n/locales/uk.json b/src/i18n/locales/uk.json
index 7f6c8c3e2..c0fab8533 100644
--- a/src/i18n/locales/uk.json
+++ b/src/i18n/locales/uk.json
@@ -3303,7 +3303,6 @@
   "Loading photo...": "Завантаження фото…",
   "Photo unavailable": "Фото недоступне",
   "Location obscured to a 0.2° cell": "Місцеположення приховано в комірці 0,2°",
-  "Open on Acartia ↗": "Відкрити на Acartia ↗",
   "Photo of {name}": "Фото {name}",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",
diff --git a/src/i18n/locales/zh-CN.json b/src/i18n/locales/zh-CN.json
index 28854ce5d..8687af790 100644
--- a/src/i18n/locales/zh-CN.json
+++ b/src/i18n/locales/zh-CN.json
@@ -3078,7 +3078,6 @@
   "Loading photo...": "正在加载照片…",
   "Photo unavailable": "照片不可用",
   "Location obscured to a 0.2° cell": "位置已模糊至0.2°网格",
-  "Open on Acartia ↗": "在Acartia上打开 ↗",
   "Photo of {name}": "{name}的照片",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",
diff --git a/src/i18n/locales/zh-Hant.json b/src/i18n/locales/zh-Hant.json
index 63088293a..a95e71dd5 100644
--- a/src/i18n/locales/zh-Hant.json
+++ b/src/i18n/locales/zh-Hant.json
@@ -3078,7 +3078,6 @@
   "Loading photo...": "正在載入照片…",
   "Photo unavailable": "照片無法使用",
   "Location obscured to a 0.2° cell": "位置已模糊至0.2°網格",
-  "Open on Acartia ↗": "在Acartia上開啟 ↗",
   "Photo of {name}": "{name}的照片",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",
diff --git a/src/layers/wildlifeSightings/records.js b/src/layers/wildlifeSightings/records.js
index a1e50f52c..1af1cc296 100644
--- a/src/layers/wildlifeSightings/records.js
+++ b/src/layers/wildlifeSightings/records.js
@@ -247,18 +247,9 @@ export function normalizeInatObservations(
   return rows;
 }
 
-function acartiaLink(value) {
-  if (typeof value !== 'string' || value.length > 500)
-    return 'https://acartia.io';
-  try {
-    const url = new URL(value);
-    return url.protocol === 'https:' && !url.username && !url.password
-      ? url.href
-      : 'https://acartia.io';
-  } catch {
-    return 'https://acartia.io';
-  }
-}
+// Acartia has no documented per-sighting page, and photo_url is supplied by the
+// contributor. The source link is therefore always the Acartia site itself.
+export const ACARTIA_SITE = 'https://acartia.io/';
 
 /** Acartia documents flat rows only. Name and entity are text fields; unknown
  * shapes are skipped rather than guessing nested provider data. */
@@ -315,7 +306,7 @@ export function normalizeAcartiaSightings(payload, nowMs) {
       cetacean: speciesGroup === 'cetacean',
       threatened: false,
       provider: { name, entity: cleanText(raw.data_source_entity, 60) },
-      link: acartiaLink(raw.photo_url),
+      link: ACARTIA_SITE,
       photo: null,
       favesCount: 0,
       identificationAgreements: 0,
diff --git a/src/layers/wildlifeSightings/records.test.mjs b/src/layers/wildlifeSightings/records.test.mjs
index 18a1693d8..9909338a1 100644
--- a/src/layers/wildlifeSightings/records.test.mjs
+++ b/src/layers/wildlifeSightings/records.test.mjs
@@ -330,7 +330,7 @@ test('Acartia requires flat provider text, handles trust, and sanitizes type', (
   );
 });
 
-test('Acartia rejects invalid times/positions and unsafe photo links become the canonical page', () => {
+test('Acartia rejects invalid times/positions and its link is always the Acartia site', () => {
   for (const overrides of [
     { created: new Date(now - 8 * 24 * hour - 1).toISOString() },
     { created: new Date(now + 10 * 60_000 + 1).toISOString() },
@@ -341,6 +341,10 @@ test('Acartia rejects invalid times/positions and unsafe photo links become the
   ])
     assert.deepEqual(normalizeAcartiaSightings([sighting(overrides)], now), []);
   for (const photo_url of [
+    // A contributor-supplied URL is never labelled as the Acartia source.
+    'https://provider.example/photo.jpg',
+    'https://phishing.example/acartia.io/login',
+    'https://acartia.io.attacker.example/',
     'http://provider.example/p.jpg',
     'https://user:secret@provider.example/p.jpg',
     'javascript:bad()',
@@ -349,7 +353,7 @@ test('Acartia rejects invalid times/positions and unsafe photo links become the
   ]) {
     assert.equal(
       normalizeAcartiaSightings([sighting({ photo_url })], now)[0].link,
-      'https://acartia.io',
+      'https://acartia.io/',
     );
   }
 });
diff --git a/src/ui/views/panels/WildlifeSightingCard.vue b/src/ui/views/panels/WildlifeSightingCard.vue
index fc92c7ee4..9caac8fdd 100644
--- a/src/ui/views/panels/WildlifeSightingCard.vue
+++ b/src/ui/views/panels/WildlifeSightingCard.vue
@@ -2,7 +2,7 @@
 import { computed, shallowRef, useTemplateRef, watch } from 'vue';
 import { formatDate, t, translateKnown } from '../../../i18n/index.js';
 import { photoCreator, formatAge } from '../../../layers/wildlifeSightings/photoText.js';
-import { inatLicenceLabel, inatPhotoUrl, isOpenPhoto } from '../../../layers/wildlifeSightings/records.js';
+import { ACARTIA_SITE, inatLicenceLabel, inatPhotoUrl, isOpenPhoto } from '../../../layers/wildlifeSightings/records.js';
 
 const props = defineProps({
   sighting: { type: Object, required: true },
@@ -36,6 +36,8 @@ const age = computed(() => {
 });
 const observedDate = computed(() => observedDay.value ? formatDate(Date.parse(`${observedDay.value}T00:00:00Z`), { year: 'numeric', month: 'short', day: 'numeric', timeZone: 'UTC' }) : '');
 const link = computed(() => {
+  // The "Acartia" label only ever points at the Acartia site, never a row URL.
+  if (acartia.value) return ACARTIA_SITE;
   try {
     const url = new URL(props.sighting.link);
     return url.protocol === 'https:' && !url.username && !url.password ? url.href : null;
@@ -89,7 +91,6 @@ watch([() => props.sighting.stableId, () => photo.value?.src], () => { loaded.va
       </div>
     </component>
     <p v-if="acartia || taxa === 'whales'" class="wildlife-sighting-card-guidance">
-      <a v-if="acartia && !/^https:\/\/acartia\.io\/?$/.test(link || '')" href="https://acartia.io" target="_blank" rel="noopener noreferrer">{{ t('Open on Acartia ↗') }}</a>
       <a href="https://www.bewhalewise.org" target="_blank" rel="noopener noreferrer">{{ t('Be Whale Wise') }}</a>
     </p>
   </section>
diff --git a/src/ui/wildlifeSightingCard.test.mjs b/src/ui/wildlifeSightingCard.test.mjs
index d7837af7f..f685c75e0 100644
--- a/src/ui/wildlifeSightingCard.test.mjs
+++ b/src/ui/wildlifeSightingCard.test.mjs
@@ -373,6 +373,36 @@ test('missing, restricted, obscured and Acartia photos all use the same compact
     });
 });
 
+test('an Acartia card labels only the Acartia site as Acartia', async (context) => {
+  for (const link of [
+    'https://provider.example/photos/synthetic.jpg',
+    'https://acartia.io.attacker.example/',
+    'https://acartia.io/',
+  ])
+    await context.test(link, async (context) => {
+      const f = fixture(context, {
+        ...row,
+        origin: 'acartia',
+        stableId: 'acartia:456',
+        provider: { name: 'Synthetic network' },
+        link,
+      });
+      await f.click();
+      const card = f.cardElement();
+      const hrefs = [...card.querySelectorAll('a')].map((a) =>
+        a.getAttribute('href'),
+      );
+      assert.deepEqual(hrefs, [
+        'https://acartia.io/',
+        'https://www.bewhalewise.org',
+      ]);
+      assert.equal(
+        card.querySelector('.wildlife-sighting-card-source').textContent,
+        'Acartia ↗',
+      );
+    });
+});
+
 test('safe placements near each viewport edge exclude actual HUD, toolbar and rail rects', () => {
   const obstacles = [
     rect(0, 0, 260, 160),