Source of the Fils, Wiesensteig
The source of the Fils is a karst spring near Wiesensteig. The Fils rises in a dry valley, the Hasen valley, at 625m above sea level. The source of the Fils can be reached from "Bahnhöfle", Schertels Cave or from the town of Wiesensteig on broad paths. The Hasen valley itself is a popular hiking route.