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 larger massif consists of several other mountains, the principal being Vorder Sustenhorn (3,318 metres), Chli Sustenhorn (3,309 metres) on the north and Sustenlimihorn (3,316 metres) on the south.