Although the Lötschberg is one of the main north-south axes through the Alps, it is not on the main chain of the Alps, the Pennine Alps, further south, making up the main water divide. As a main north-south axis through the Alps, the Lötschberg is thus completed by the Simplon, between Brig and Domodossola in Italy. The Lötschberg alone constitutes an important shortcut from the Swiss Plateau to the Upper Valais, the alternative route involving a long detour via the lower Rhone Valley (Monthey) around the western end of the Bernese Alps.