Facing the cemetary of Moigny, take a right into the road direction Boutigny-sur-Essonne for about 600m, and then the track to the right into the fields, opposite the second track on the left into the forest. Follow this track for about 300m and turn left. Turn right into the forest after about 250m and find the boulder just to the north of the top of a small hill, marked 96 on the IGN map.