The source area of the Lippe River gave the town its name. Right next to the fortress, is the spring of the River Lippe. It takes its course, and after 237 kilometers, flows into the Rhine near Wesel. Lippe ist the the longest river in North Rhine-Westphalia.
The deep blue spring pond is affectionately called “Odin’s Eye” by locals. According to a legend, the almighty Germanic god “Odin” tore out his eye and threw it into the dry Senne landscape to bless it with moisture and flourishing life. The Lippe spring emerges from a depth of about 8 meters. With a discharge of approximately 740 liters per second, it is one of the most powerful river springs in Germany.