On an isolated boulder along the blue path to the south of the main area. Start with sidepulls, just to the left of a blue mark.
From the Bourron Marlotte bivouac follow the road directly into the woods towards Route de la Grande Vallée. Then, follow the blue trail to the right, just before the crossing with Route des Barnolets. Follow the blue trail for about 100m and the "bigger" (in comparison to the other boulders around) will be on your left, just next to the trail.