lake geneva (, , or "genfer see") is the second largest lake in central europe. the lake forms the border between france and switzerland. about three fifths are in switzerland. in total, it is about 580 km3 in size. at its deepest point it is 310 m deep, which makes it france's deepest lake. the biggest contributing river is the rhone, other important tributaries are the dranse, the venoge and the aubonne. the rhone traverses the lake, and exits at geneva. on average, its waters take 11.4 years to traverse the lake. other than geneva, important swiss cities at the lakeshore are lausanne, montreux and vevey. the biggest french city at the lakeshore is thonon-les-bains, the best known is évian-les-bains.