Vercors Cave System

The Vercors Massif (French pronunciation: [vɛʁkɔʁ], Occitan: Vercòrs) is a mountain range in eastern France consisting of rugged plateaus 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.