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
Romer Lake Christian Land peninsula to the west of the Princess Elizabeth Alps. It lies in long and narrow depression running parallel to the Denmark Fjord system further north and stretching roughly from NE to SW for about . A glacier has its terminus at the northern end and the Nunataami Elv river valley flows out of the southern end of the lake and, bending south through the valley known as "Vandredalen", it discharges its waters in the northern inner arm of the Ingolf Sound of the Greenland Sea. Romer Lake is famous for its impressive Elephant Foot Glacier, a wide piedmont