Right problem on the east face of 'La Roche qui Tremble', marked with a black arrow, between Bisteak and Le Cul du Requin. Start with a good hold, without the pedestal, and exit directly.
This very special boulder is located about 200m south of the large boulder with L'Étrave Casse-Pot. Follow the path through the valley to the south. After about 100m you cross the GR. Follow the path for another 50m and turn right on the yellow marked path. After about 50m you can see the block on the right.
