Meet at the Arquebuse car park at the foot of the Tour de Lierre or Tour François 1er.
(S) Leave the car park and turn right onto Rue de l'Arquebuse. Follow it for about 150 metres, leaving Chemin Mont Goubot on your left.
(1) Turn left and climb the very steep Allée des Buis. At the fork, at the calvary, continue left on the tarmac path for 350 metres.
(2) Continue left onto the gravel path which, after a few dozen metres, gives way to a path through the box trees. Follow the path north-east to the T-junction.
(3) Turn left and, after a few dozen metres, turn right. Follow the path first through fields and then downhill into the forest until you reach the junction with the new gravel forest road.
(4) Cross the new forest road and take the path that descends the Crainseny Valley for about 1.4 km.
(5) Pass under the Crainseny Viaduct and continue along the path heading north-east.
(6) At the junction, turn left (west) towards Culles-les-Roches. After about 1 km, note the Moulin de Châtenay mill on the left, on the Mouille stream. About 400 m further on, take the street slightly to the left crossing the lower part of the village of Culles-les-Roches. Continue to the T-junction with the Route de la Forêt.
(7) Turn left onto Route de la Forêt (GR®76, red and white markings), descend towards the Mouille stream, then climb back up to Pertuis du Bois
(8) Cross the old railway line and continue climbing up Route de la Forêt. Before descending to Saint-Gengoux, leave the road and take a forest path on the left (again, follow the red and white markings). Cross the Bois des Saules to the T-junction at Les Chaumonts.
(9) Continue straight ahead, still following theGR®, on the tarmac road and pass La Culasse. Continue south for about 1 km.
(10) At a place called La Combe, leave theGR® and continue straight ahead, then turn right down the path (not shown on the map) that leads between the vineyards towards Bourg-Hameau. At the entrance to a wood, turn left and take the very steep path to reach a road.
(11) Turn left onto the road and continue for 350 metres to return to the starting point.
