Rotelsee (also Rotelschsee)[1] is a lake near Simplon Pass in the canton of Valais, Switzerland.

[2] 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.

[3] Lake Rotel lies only 300m from the watershed between Po and Rhône[4] The water of Rotelsee flows → Chrummbach → Diveria → Toce → Lake Maggiore → Ticino → Po → Adriatic Sea.

This article related to a lake in Valais is a stub.