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
Little Salmon River (Lake Ontario) approximately watershed, which is primarily agricultural and residential in nature. The river rises at the confluence of the North Branch Little Salmon River and South Branch Little Salmon River in the eastern part of the town of Mexico, west of the village of Parish. From there, the river flows northwest through the village of Mexico and the hamlet of Texas before emptying into Lake Ontario at Mexico Point. The lower Little Salmon River provides habitat for a variety of resident fish species, including brown bullhead, white suckers, rock bass, largemouth bass, and northern pike. In addition, several lake-dwelling species enter