 The only noteworthy inflows above ground are the Kotbach, which flows into the northwest tip of the lake, and the Weiterbach in the south.The lake is a 'blind lake', since there is no above-ground drain and water can only drain off or seep away underground, due to the location of the pool.It is believed that the source area of ​​the Kreppbach (locality Rohrlaine), which is located almost 2 km northeast, is fed underground by Eibsee waters.