The Aare springs from glaciers in Guttannen. There are four lakes in the municipality: Lake Oberaar, Lake Grimsel, Lake Räterichsboden and Lake Gelmer. In the western part of the municipality are the mountains Schreckhorn, Lauteraarhorn, Finsteraarhorn, Agassizhorn and Sidelhorn. Guttannen also includes Finsteraar Glacier, Lauteraar Glacier, Unteraar Glacier, Grueben Glacier, and Bächli Glacier.