Arete along the Sentier de l'Escalier, to the south of Léon.
Access
From Recloses, take Le Chemin de la Butte Blanche up to the Sentier de l'Escalier to the left (blue circles) that goes up to the plateau; the boulder is on the left, past the intersection with Sentier de l'Orme and La Dalle de l'Escalier.