Lake Geneva ends in Geneva, where the lake level is maintained by the Seujet dam. The average discharge from Lake Geneva is . In Geneva, the Rhône receives the waters of the Arve from the Mont Blanc. After a course of the Rhône leaves Switzerland and enters the southern Jura Mountains. It then turns toward the south past the Bourget Lake which it is connected by the Savières channel. At Lyon, which is the biggest city along its course, the Rhône meets its biggest tributary, the Saône. The Saône carries and the Rhône itself . From the confluence, the Rhône follows the southbound direction of the Saône. Along the Rhône Valley, it is joined on the right (western) bank by the rivers Eyrieux, Ardèche, Cèze, and Gardon coming from the Cévennes mountains; and on the left bank by the rivers Isère, with an average discharge of , Drôme, Ouvèze, and Durance at from the Alps.