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Departure from the car park of the new cemetery in Saint-Chéron, north of the town, near the D132. For access by RER, see the practical information section.
(S/E) Head west on a path (red and whiteGR®11markings). Carefully cross the Rambouillet road (D132) and take a beautiful path opposite. Keep heading west with theGR®. At an intersection, turn left into a large forest lane.
(1) At the next intersection, turn left at a right angle. At the next crossroads (elevation 154), go straight ahead. Follow this pretty path, ignoring the turnings on the right, and descend to the D116.
(2) Turn right and cross the road at the pedestrian crossing. First turn right then left to take Rue du Coteau Nord. Cross the railway line at the level crossing and, at the three-way junction immediately ahead, turn left onto Rue du Coteau Nord. At the roundabout, continue straight ahead onto Rue du Coteau Sud and cross the Orge.
(3) After No. 9, turn left onto a path that leads to the Plaine de Saint-Evroult. Continue straight ahead, passing under a high-voltage power line and then below a secondary school on the right. Reach the Orge river and pass under a road bridge. At the next intersection, turn left and you will soon reach the banks of the Orge.
(4) Then turn right (do not take the footbridge). Walk along the river on your left, following the path through the wetland. Come out onto Rue du Gué and follow it to the right (you will see the red and whiteGR®11markings again). Cross Rue du Moulin on the right-hand side and continue straight ahead. Come out onto Rue de Chantropin and follow it to the left.
(5) Turn right at thesecond road, Chemin du Bois des Roches, still following theGR®. Climb this fairly rugged path. At the top, turn right (south) onto a small road. At the crossroads, go straight ahead between the fields. Join the D132 and follow it carefully.
(6) After about 100 metres, turn left towards the hamlet of Bois des Roches and enter a wood (leaving the marked trail). Leave the few houses on your right. Then turn sharply right, following a fence on your left.
(7) After about 400 metres, turn left into a passageway that descends into the old quarries (there are several passageways, choose the most passable one). Walk eastwards at the bottom of the old sandstone quarries, through the heather and at the foot of high walls, and note some remains of the quarrying activity. At the crossroads (elevation 139), turn left to stay in the quarries. Walk north-east then north.
(8) Leave the quarries, turn left (west-northwest) and walk on flat ground through the woods.
(9) At the intersection at the edge of the woods, turn right and stay in the woods. At the next three-way junction, turn left. After about 150 m, turn left at a right angle and descend into the woods.
(10) At the T-junction, rejoin theGR®1and follow it to the left (red and white markings). Walk west for about 600 m. Take thefirst path on the right (elevation 94; leave theGR®) and descend.
(11) At the bottom, turn left. Leave the woods and head towards the hamlet of Mirgaudon.
(12) When you reach the first houses, turn right onto a path and leave the houses on your left. After about 75 m, turn right into a small wood. At the next crossroads, first turn right then left (information sign) to cross the Orge river again. Join a small street and cross the railway line at the level crossing. Turn left along the street and you will immediately come to an intersection (access to Saint-Chéron station).
(13) Follow Rue Gabreau to the right and climb steeply. Cross the D116 with caution and make the first turn right then left to take Rue des Frères Capitaine. Shortly before the end of this street, turn left onto a path towards Rue des Châtaigniers. Take thefirst right, Allée des Châtaigniers. At the end, turn right onto Rue Paul Payenneville. Cross Allée des Acacias on the right-hand side and, when the street turns right, turn left onto Chemin de Villepierreuse and continue for a few metres.
(14) Immediately turn left (east) onto Chemin des Parignons. Continue straight ahead and, at the end of the road, turn left and downhill onto Rue Bouillon-Lagrange. Then turn right onto Sente des Vignes. Turn left onto this path.
(15) At the end, turn right and go up Route de Rambouillet (D132). At the fork, turn right onto Rue Henri Louin. At the next intersection, keep left. Walk along the cemetery on your right and you will soon reach the car park (S/E).
Visorando Member
Very difficult 
