diff --git a/backend/public/assets/logo-radarsargasses971.png b/backend/public/assets/logo-radarsargasses971.png
new file mode 100644
index 0000000..43b6686
Binary files /dev/null and b/backend/public/assets/logo-radarsargasses971.png differ
diff --git a/frontend/src/components/Map/SargassesMap.css b/frontend/src/components/Map/SargassesMap.css
index 771db57..258f246 100644
--- a/frontend/src/components/Map/SargassesMap.css
+++ b/frontend/src/components/Map/SargassesMap.css
@@ -1,3 +1,14 @@
+/* ── Logo ── */
+.smap-logo {
+  position: absolute;
+  top: 12px;
+  left: 12px;
+  width: 110px;
+  pointer-events: none;
+  z-index: 5;
+  filter: drop-shadow(1px 2px 3px rgba(0,0,0,0.25));
+}
+
 /* ── Indicateur fraîcheur données ── */
 .smap-freshness {
   position: absolute;
diff --git a/frontend/src/components/Map/SargassesMap.jsx b/frontend/src/components/Map/SargassesMap.jsx
index 503087a..4890561 100644
--- a/frontend/src/components/Map/SargassesMap.jsx
+++ b/frontend/src/components/Map/SargassesMap.jsx
@@ -271,6 +271,8 @@ export default function SargassesMap({ onSpotSelect, selectedSpotId, activeStep,
     >
       <NavigationControl position="bottom-right" />
 
+      <img src="/assets/logo-radarsargasses971.png" className="smap-logo" alt="Radar Sargasses 971" />
+
       {dataDate && (
         <div className="smap-freshness">
           Données du {dataDate.toLocaleDateString('fr-FR', { day: '2-digit', month: '2-digit' })}