diff --git a/guide/age-of-dwarves/src/vite-plugins/simCachePlugin.ts b/guide/age-of-dwarves/src/vite-plugins/simCachePlugin.ts
index 21924289..426e0e52 100644
--- a/guide/age-of-dwarves/src/vite-plugins/simCachePlugin.ts
+++ b/guide/age-of-dwarves/src/vite-plugins/simCachePlugin.ts
@@ -32,8 +32,8 @@ export function simCachePlugin(): Plugin {
       }
     }
 
-    // Load climate params (extract only numeric values)
-    const paramsPath = path.join(dataDir, 'climate_params.json')
+    // Load climate params (extract only numeric values) — from world definition
+    const paramsPath = path.resolve(root, '../../engine/src/worlds/earth/climate_params.json')
     const rawParams = JSON.parse(fs.readFileSync(paramsPath, 'utf8')) as Record<string, unknown>
     climateParams = {}
     for (const [k, v] of Object.entries(rawParams)) {