n°2 of the topo de la Gorge aux Châts, at the top of the hill, in the South part of the area (plot 102). From the parkinglot, follow the Chemin de Gorge aux Châts and take the blue path on the right for 150m; the boulder is a few meters to the right of the path. Start 1m50 to the left of the vertical crack, traverse to the right and exit via the crack and slopers.