A natural wonder at Lake Walen!
In the ravine in which the imposing Seerenbach Falls plunge to the depths, the source of the Rin also makes its appearance. From a subterranean cavern system substantial masses of water pour down a chasm 22 metres to the bottom. At the beginning of the 20th century scientists started to investigate the source and the multi-branched cave system. Various expeditions furnished with diving equipment explored the Rin cave and penetrated over 1000 metres into the core of the mountain.
A gallery leading to the outside serves, after the rainy period and during the melting of the snow, as high water spillway of the underground river system. About 3000 metres distant from the cave entrance there is a branch where the water vanishes inside the mountain. Where to?
