The lake is mostly within the borders of the Canton of Zug, with about at its southern end in the canton Schwyz, while the Canton of Lucerne claims about to the north of Immensee. Toward the south-west extremity of the lake the Rigi descends rather steeply to the water's edge, while part of its east shore forms a narrow level band at the foot of the 1,583 m (5,194 ft) Rossberg, and the Zugerberg. The culminating point of the lake's drainage basin is the summit of the Rigi at 1,798 m.