The Plessur Alps are a mountain range in the Alps of eastern Switzerland. They are considered to be part of the Western Rhaetian Alps. They are named after the river Plessur, which originates from the center of the ranges. The Plessur Alps are separated from the Glarus Alps in the west by the Rhine valley; from the Rätikon range in the north by the Landquart river valley (Prättigau); from the Albula Alps in the south-east by the Landwasser river valley; from the Oberhalbstein Alps in the south by the Albula river valley.