No climbing during hunting season: from mid-September until March.

From the parking lot of the classical sector of Beauvais Nainville, take the direction Champcueil on the D75 and turn left towards Loutteville. At the entrance of Champcueil, take the first road to the left (at the cimetery) across a dwelling zone, fields and then the forest, up to a large barreer. Park the car and take the right branch of the road for 100m and turn left at the underground part of the aquaduct; the boulders are located 250m further, to the right of the stairs in the slope.