The descent from the sanctuary will allow you to take a look at your entire route, through the hamlets of the valley, then the mountain pastures, and finally, during the ascent, in the large mineral breaks. A demanding but varied itinerary.
From Grenoble take the A48 motorway, exit 8: direction Gap Briançon Vizille Stations de l’Oisans then the N85 via Vizille - Laffrey or the D529 via La Motte d'Aveillans direction Corps then the D 212c