Those art-deco tourism posters you’ll see all over Morocco showing a red-and-white kasbah in a rocky oasis aren’t exaggerating: just 6.5km into the gorge the old Glaoui kasbah of Aït Youl is set against a lush backdrop of almond and fig trees. A couple of kilometres past Aït Youl, the road crosses an oued; this river valley offers a sneaky back way to Kelaâ M’Gouna on foot.