Lake Geneva is divided into three parts because of its different forms of formation (sedimentation, tectonic folding, glacial erosion): According to the Swiss Federal Office of Topography, swisstopo, "Lac de Genève" designates that part of the "Petit Lac", which lies within the cantonal borders of Geneva (excluding the cantonal exclave Céligny), so about from Versoix–Hermance to the Rhône outflow in Geneva. The Chablais Alps border is its southern shore, the western Bernese Alps lie over its eastern side. The high summits of Grand Combin and Mont Blanc are visible from some places. Compagnie Générale de Navigation sur le lac Léman (CGN) operates
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