The massif consists of smaller mountain chains including Mont Thabor as well as those of the Grand Galibier, Mont Chaberton and the Rois Mages. 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.