Rotelsee
Rotelsee is a lake near Simplon Pass in the canton of Valais, Switzerland. The water of the lake powers a small turbine in the monastery Simplon Hospice. The distance from the lake to the monastery is 220m and the difference of altitude is 30m.
Lake Rotel lies only 300m from the watershed between Po and Rhône
The water of Rotelsee flows → Chrummbach → Diveria → Toce → Lake Maggiore → Ticino → Po → Adriatic Sea.