The Sustenhorn is a 3,503 metre high mountain in the Uri Alps, located on the border between the cantons of Bern and Uri. It overlook Susten Pass from the south.Both sides of the massif are glaciated. On the west side (Bern) lies the Stein Glacier and on the east side (Uri) lies the smaller Flachensteinfirn. The massif consists of several summits, the principal being Chli Sustenhorn (3,318 metres) on the north and Sustenlimihorn (3,316 metres) on the south.