It is bordered by the massif de la Vanoise to the north, the massif du Mont-Cenis to the north-east, the  Alpes Cottiennes to the east, the massif du Queyras and Écrins to the south and the massif d'Arvan-Villards to the west.
The region is situated within a network of mountains: the massif de la Vanoise to the north, the massif du Mont-Cenis to the northeast, the Alpes Cottiennes to the east, the massif du Queyras and Écrins to the south, and the massif d'Arvan-Villards to the west.