Rhône-Alpes is located in the southeast of France. The neighboring (pre-2016) regions are Bourgogne (Burgundy) and Franche-Comté to the north, Auvergne to the west, Languedoc-Roussillon to the southwest, and Provence-Alpes-Côte d'Azur to the south. The eastern part of the region is in the Alps, and borders Switzerland and Italy. The highest peak is Mont Blanc, on the French-Italian border. The central part of the region comprises the river valleys of the Rhône and the Saône. The confluence of these two rivers is at Lyon. The western part of the region contains the start of the Massif Central mountain range. The region also borders or contains major lakes such as Lake Geneva (Lac Léman) and Lake Annecy. The Ardèche flows through the southwest portion of the region, where it has carved the deepest gorge in Europe.