Aix-Les-Bains is located in the southeast of France, east of Lyon. The town is located in a corridor between the mountain of Mont Revard, the first natural rampart of the Massif des Bauges to the east and the Lac du Bourget, the largest natural lake of France to the west. Thus, the city extends mostly on a north-south axis. Its extension is such that its agglomeration merges gradually with that of Chambéry. The area of the commune is , which is large for the Department. The town is traditionally divided into two, the lower town that occupies the banks of the lake to the west and the upper town, where the town centre is located, overlooking the Lac du Bourget. The town was first built on the heights in order to avoid the many floods of the lake until it was regulated by the dam of the Compagnie Nationale du Rhône (CNR) between the Rhône and the natural spillway of lake, the Canal de Savières. The average altitude of the city is about while the lower part of it is only around , at the level of the lake.