Coming from Malesherbes, traverse the village of Nanteau, park the car to the right, near a house with a white gate and a bus stop, and take a path to the right into the forest. Turn right after 150 metres (just before the path goes uphill) into a chaos of boulders. The problem is on the right side of the chaos on the hill, 100m past Le Surplomb de Villetard.