The municipality is the capital of the Monthey District. This urban center of the Chablais region is located on an alluvial fan of the Vieze on the left bank of the Rhône, at the entrance to Val d'Illiez and the Pas de Morgins which leads to Val d'Abondance. It consists of the town of Monthey, the villages of Outrevièze and Choëx and exclaves in Collombey-Muraz. Monthey is located on the west side of the Rhône valley, south to the Leman Lake.