Switzerland encompasses a significant portion of the south side of the Alps. Most of it is constituted by the canton of Ticino, almost reaching the plains of the Po and including Switzerland's lowest point on Lake Maggiore (). The canton of Graubünden is also partially located on the south side of the Alps with the four valleys of Misox, Bregaglia, Poschiavo and Müstair. Finally, the canton of Valais comprises the upper Diveria valley, located south of the Simplon Pass.