The Vercors Massif is a range consisting of rugged plateaux and mountains straddling the départements of Isère and Drôme in the French Prealps. It lies west of the Dauphiné Alps, from which it is separated by the rivers Drac and Isère. The cliffs at the massif's eastern limit face the city of Grenoble. At the fringes of the massif, the Vercors regional park has four geographical areas. The Royans, the north-west foothills are the location of walnuts growing. Three valleys descend to the edge of the Royans: the Gorges de la Bourne, the cirque of the Combe Laval, and the Échevis valley, including the Petits and the Grands Goulets.
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