Two kilometers below Warching, the stream seeps into sinkholes at a retention basin, usually completely in summer. The percolated water of the upper Gailach emerges again after about four kilometers of underground flow from the Gailach spring in Mühlheim.
Somewhat off the hiking trail, this small valley section is hidden in the landscape. Time has left its mark on the stones. What was once mighty is slowly giving way, dropping a few stones. Vegetation is also reclaiming this area.