On the north side of the Susten Pass the ranges are lower and, except the highest mountains on the south, free of glaciers. The main ridge, culminating at the Titlis divides the basins of the Aare and the Reuss. From the Grassen, tripoint border between the cantons of Berne, Obwalden and Uri, a small range diverges from the main watershed and runs from west to east and culminates at the Gross Spannort.