Alps rivers such as the Danube have major tributaries flowing into them that originate in the Alps. The Rhône is second to the Nile as a freshwater source to the Mediterranean Sea; the river begins as glacial meltwater, flows into Lake Geneva, and from there to France where one of its uses is to cool nuclear power plants. The Rhine originates in a 30 square kilometre area in Switzerland and represents almost 60 percent of water exported from the country. Tributary valleys, some of which are complicated, channel water to the main valleys which can experience flooding during the snow melt
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).