On a boulder along La Route des Barnolets, near the bivouac of Bourron-Marlotte. Start as for Whey Left, traverse all the way right to the arete (without mantling up on the 'mushroom' by convention) and exit as for The Whey of the Warrior.
From the bivouac of Bourron-Marlotte, follow La Route de la Grande Vallée for 200m eand take La Route des Barnolets on the right. The boulder is 250m further, on the right of the path.
