Starzlachklamm is the anchor that keeps Sonthofen from being just another Alpine base. The Starzlach stream has cut a tight gorge below the Grunten, and a maintained path follows the water through rock walls, small falls, and damp ledges.
It is also one of the Allgau's well-known canyoning spots, but you do not need ropes or a wetsuit to enjoy it. For most travellers, the gorge walk is the right scale: short, dramatic, and easy to fit into a spare day.