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Departure from Bornes du Planet, on the D936 road between Saint-Léger-en-Yvelines and Condé-sur-Vesgre. Coming from Saint-Léger, the car park is on the right-hand side of the road, opposite a small sandstone rock (boundary marker).
Orange markings
(S/E) Go through the forest gate at the end of the car park and head north-east on a good path (there is no marker on the gate but there is one on the "3.5t" road sign at the entrance to the car park). Walk along a fence on your right, which ends at a gate, and continue straight on to the Carrefour de la Pierre Ardoue.
(1) Turn right and leave the old forest house of Vallée Moussue on your left. Climb slightly through a fern undergrowth. At the first crossroads, continue straight ahead. At the fork a few metres further on, take the narrower path on the right.
Orange + red and white markings
(2) At the next crossroads, continue straight ahead and now follow theGR®1. At the fork immediately ahead, turn left (the fork is located at the level of the signposts). You will immediately see the Pierre Ardoue dolmen on your left.
(3) Continue along the path, leaving the dolmen on your left, and you will soon come to a T-junction. Turn left and climb slightly. The path becomes narrower and continues to climb through birch trees and young pines. At the next T-junction, turn right, go through a forest gate and climb with a property wall on your right. At the top of the hill, the path gives way to tarmac, with fences on the right.
(4) At the junction, follow Chemin de la Citerne to the left and walk alongside a riding centre on your right. After the last houses, note the old underground masonry cistern on your left (access prohibited for safety reasons). About 200m further on, cross the D111 road and continue along the path opposite.
(5) At the next crossroads (large oak and pine tree in the middle), turn right. Walk along the left-hand side of a sparse pine forest, then a plot of land that has probably been recently cut and is overgrown with ferns, until you reach Carrefour Bailly. Then turn left onto Route de Monnereau à Saint-Léger (signposted).
Red and white markings
At Carrefour des Ponts Quentin, ignore the orange markings on the right and continue straight ahead on theGR®1. Descend slightly on a stony path.
(6) At the crossroads at the bottom of the descent, turn left and follow theGR®22(theGR®1goes to the right; do not cross the stream). Walk along the bottom of the valley on the Route aux Vaches, with a pine forest on the slope on your left and the stream on your right. Ignore a path on the left and cross the stream. Immediately ignore a path coming from the right, continue through the valley and ignore two bridges on the left.
No markings
(7) At the junction with Route Roulée (sign on the path on the right), leave theGR®22, turn left and cross the stream again. Follow Route Roulée (sign on the left) south-westwards on a slight incline. Ignore a path on the left and climb more steeply. At the top of the hill, the path veers left (south-southeast). At the next junction, continue straight ahead and walk through more open terrain. At the next junction (fence on the left), continue straight ahead, slightly to the right (southwest) towards a forest barrier and under the pine trees.
(8) On the other side of the D111 road, you will see two paths with a forest barrier: cross the road and follow the path on the right (west-southwest), the Route de la Harasserie. In a pine forest with fern undergrowth, descend slightly, then follow a rollercoaster-like path before finally climbing back up to a crossroads with a signpost.
(9) At the crossroads, take the3rd path on the left: this path is not named on the signpost, it heads south-southwest between two wider paths marked in orange. Descend and ignore a vague perpendicular path. At the T-junction, follow the wide Route de la Pierre Ardoue on the right.
(10) After about 200 metres, turn sharply left onto a sandy path heading due south (be careful, this path is discreet; on the IGN map, two paths start from this point, but the south-west facing path does not exist). Cross another sandy path and continue south on the path that winds through the heather. Come out onto the path taken at the very beginning of the hike, face a barrier, turn right and quickly reach the car park (S/E).
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Visorando Member
Easy 
