The Samnaun Alps are separated from the Sesvenna Alps in the south by the Engadine Valley; from the Silvretta Alps in the west by the Fimber Pass; from the Verwall Alps and the Lechtal Alps in the north by the Paznauntal; from the Ötztal Alps in the east by the Inn valley. All the range is drained by the river Inn, through the Trisanna, Schergenbach, Brancla and Fimbabach.