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Departure from the Feuillardière car park, along the D409 between Milly-la-Forêt and Arbonne-la-Forêt.
No signposts
(S/E) At the car park entrance, with your back to the road, head south onto Chemin de la Borne à l'Enfant (signposted "Promenade de Sucremont") and pass a sort of hollow on your right.
(1) About 150m after the starting point, turn right onto a path marked "Chemin de la Sapinière" on the 1:25,000 map (incorrect name, the path with a sign bearing this name is the next one, further south). Be careful here, as there are no signs and few landmarks (however, there is a shrub on the right-hand corner of the crossroads, with much taller pine trees behind it). Head west, staying on the main path, which is slightly higher than the surrounding area. At a fork (post with a yellow silhouette of hikers on the left), turn right. Ignore a vague path on the left (not shown on the map) and when a well-marked path comes from the left, turn right (north).
(2) Cross the D409 road (be careful, this road is busy). Continue opposite on Chemin de la Passée aux Moutons. Immediately cross a perpendicular path and continue north on a wide white track that winds through the forest. Ignore a path on the left and then another one on the right (forest plot no. 61, small rock).
Red and white markings
(3) At the next junction, join theGR®11coming from the right and continue straight ahead. Ignore the Chemin de la Vielle Grange and the Chemin de la Barrière Matéo on your left. Climb slightly up the path, which has now become paved.
(4) Just before reaching a small pass, turn left onto a path (be careful, the start is difficult to see; if you go downhill, turn back). Climb this winding path and pass a first summit covered with pine trees (viewpoint). Continue west and wind your way through the heather and then under the pine trees. Climb again through the heather and broom, with birch trees, many of which have been felled or pollarded (storm?). Pass a second summit (viewpoint) and continue west through very young trees. Pass a third summit covered with rocks. Descend gently with a slope littered with felled tree trunks on your right. When you reach a rocky ledge (beautiful view to the south), turn right under the pine trees. Descend with a few hairpin bends, then climb up opposite. At a fork, turn right and pass a small rocky outcrop. Then descend with steep hairpin bends.
(5) At the bottom, at the T-junction, turn right onto Chemin de Coquibus, an old gravel road that descends with a few bends and soon gives way to a sandy path.
(6) At the next junction, turn left onto Chemin de la Roche qui Tourne and follow it west-northwest for about 3 km, ignoring the side roads. Cross Chemin du Polissoir. At the three-way junction that follows (Carrefour des Côtes de Courances), turn right. At the next junction (plot no. 39), turn left. At the fork, turn right and continue on the main road until you reach the aqueduct (arcades).
No signposts
(7) Ignore the red and white arrow pointing left, continue straight ahead and pass under the aqueduct. Continue straight ahead (west; sandstone marker). Walk through the forest with a few rocks on either side. Pass the Carrefour de la Gorge aux Fauves, which is easier to spot by its sign than by any perpendicular path... At a fork shortly before reaching the edge of the forest (fenced plot with beehives on the right), turn left onto Chemin de Courances à Coquibus.
Yellow + red and white markings
(8) At the T-junction that follows shortly after, rejoin theGR®11and follow it to the left (south-east). At a fork, turn right and continue along the wide path, ignoring the paths branching off to the sides.
(9) At a triple fork (sign for "piste cavalière" on the left), leave the wide path, which becomes gravelly, and turn right onto a poorly marked trail. Climb up the switchbacks and reach the northern edge of a plateau (signposted "Réserve Biologique Dirigée"). Turn right and then gradually veer left to cross the plateau through the heather and rocks protruding from the ground. When you reach the southern edge of the plateau (viewpoint), turn left (east).
(10) At the crossroads (small hill covered with pine trees), turn right and descend between the rocks. At a sign for "Réserve Biologique Dirigée", continue straight ahead (sand). At a fork, take the left. Walk east-southeast on a narrow sandy path, surrounded by heather and birch trees, with rocks on your left. Continue up a sort of gorge. Pass some short posts across the path, come out onto a small road and follow it to the left.
No signposts
(11) At the crossroads, leave theGR® trail turning left towards the Ferme de Coquibus and continue straight ahead on the gravel path of the same name (east). At the Carrefour de la Réserve, continue straight ahead. You will then cross a narrower path (and the underground aqueduct). Just after a tree with five trunks on the right, ignore the Chemin du Parc aux Boeufs on the right. Continue on the main path which curves to the left (north-east). At a three-way junction (plot no. 50), turn right (east). After a right-hand bend in the path, you will come to a fork in open ground (plots no. 49 and no. 53).
(12) Leave the path on your left and turn right (south) onto Chemin du Raboliot. Walk again through a flat landscape with heather, birch trees and rocks protruding from the ground. Pass a pond on your left (the path may be wet here). At a marker on the left, turn right onto the path. At a fork (sign saying "Interdit aux cavaliers à droite" [No horse riding on the right]), turn left and note a sign saying "Zone sensible à l'érosion" [Erosion-sensitive area]. Continue straight ahead, still on Chemin du Raboliot, pass a chicane and arrive at a viewpoint (rock ledge). Then turn left onto a faint path that starts to the left of a small birch tree with a trunk leaning significantly to the left. Descend slightly on the path equipped with wooden steps.
(13) At the Carrefour des 4 Héros, turn left (east) onto a sandy path. Then descend under the pine trees, heading east-southeast. Pass a chicane (signposted "Chemin de la Barrière Matéo" on the right), come out at a hairpin bend onto a wider path and follow it to the right. Head east on a good path between plots no. 54 (on your left) and no. 56 (on your right), ignoring the paths branching off to the sides. At the junction with Chemin des Engoulevents coming from the left, continue straight ahead for a few metres.
(14) Just after a sign for "Chemin de la Barrière Matéo" on the left, turn right (south). At the next fork (large oak tree with the number 63), turn left (east-southeast). Ignore a track on the right immediately after a sign for "Chemin des Vieilles Granges" and, at the crossroads shortly after (elevation 70), turn right (south) onto Chemin du Chapeau de Napoléon. At a fork, turn left. After a right-hand bend in the road, at a crossroads, turn left onto Chemin de Milly à Arbonne. Head east-northeast, crossing two other roads, until you reach the crossroads you passed on the way there.
(3) Turn right onto Chemin de la Passée aux Moutons and easily rejoin the D409 road.
(2) Cross the road (take care) and continue straight ahead on Chemin de la Sapinière (you can't go wrong here), ignoring the faint tracks on either side. At the fork, take the less marked path on the left and ignore a faint track immediately on the right. At the next fork (signpost with a yellow silhouette of hikers), turn left. Continue east, ignoring the paths on either side.
(1) At the T-junction, turn left and quickly reach the Feuillardière car park (S/E).
Visorando member
Difficult 
