The great crossing of Vercors (GTV in French for Grande Traversée du Vercors, do not mix up with TGV the French fast train!) is a set of trails by foot, mountain bike, horse, ski or snowshoes in the Natural Regional Park of the Vercors. But this article is about the great loop: 390 kilometers and 20 (+/-) days hike around the Vercors’ mountains and its variant through the Natural Reserve: 60 kilometers in 3 to 4 days. Here luxury lies in the natural simplicity of the surroundings and in the authentic scenery.