diff --git a/web/static/map.js b/web/static/map.js
index 6ef4996..cf5a2ed 100644
--- a/web/static/map.js
+++ b/web/static/map.js
@@ -205,4 +205,9 @@
         .addOverlay(zonesOverlay, zones.getAttribute('aria-label'))
         .addTo(map)
     ;
+
+    const params = new URLSearchParams(window.location.search);
+    if (params.has('zones')) {
+        map.addLayer(zonesOverlay);
+    }
 })();