Bernese Alps through which the Rhône finds its way to Lake Geneva, to the Grimsel Pass or, depending on the definition, to the river Reuss (thus including the Uri Alps). The principal ridge, a chain that runs from west (Dent de Morcles) to east (Sidelhorn), whose highest peak is the Finsteraarhorn, forms the watershed between the cantons of Bern and Valais. Except for the westernmost part, it is also the watershed between the Rhine (North Sea) and the Rhône (Mediterranean Sea). This chain is not centered inside the range but lies close (10 to 15 km) to the Rhône on the south.
Périgny River River, Lake Waswanipi; The Périgny River rises from a forest stream near Highway 1018 (North-South direction) at the foot of the Waswanipi Hills, at: From its source, the "Périgny River" flows on according to the following segments: The Périgny River flows into a river bend on the south shore of the [O'Sullivan River], which generally flows northward to the south shore of Lake Waswanipi. From this mouth, the current flows north on the Lake Waswanipi to its mouth. From there, the current flows first north through the Waswanipi River, then west to the east shore of Goéland Lake (Waswanipi River).