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Departure from Chaville Rive-Gauche station (Transilien line N, between Paris-Montparnasse and Versailles-Chantiers).
The following description refers to signposts, where applicable, and to the forest plot numbers painted on the trees.
Yellow markings
(S/E) When you leave the station, turn left onto Rue Anatole France and go under the railway bridge (painted walls). Immediately after, turn left onto Route des Huit Bouteilles, which runs parallel to the railway tracks. At the fork, take the right-hand path. Opposite the cemetery entrance gate, turn right to enter the Parc forestier de la Mare Adam. At the arrow indicating a left turn, ignore the path that actually turns left along the cemetery and turn left a little further on, staying on the wide, stable path.
Yellow + red and yellow markings
(1) Let the path turn left, go through a gate and continue straight ahead towards a forest barrier behind which a road passes. Before the forest barrier, take the path on the right that goes downhill. Cross a road (forest plots nos. 66 and 67). Continue straight ahead, heading south-east, ignoring the paths that branch off to the left and right. You will come out onto Rue Alexis Maneyrol: opposite, a sign indicates "Vélizy-Villacoublay", with the Etang d'Ursine (information sign) behind it.
Red and yellow markings
(2) Take the path along the bank of the pond. Walk along the pond, keeping to the right, i.e. parallel to Route Sablée and then parallel to Rue Paul Doumer. Before a large weeping willow, cross the lawn on the right and take Rue Paul Doumer. Turn right onto Rue de la Concorde, cross the square of the same name, continue along Rue de la Concorde and you will come to a T-junction. Leave the red and yellow markings for a moment (ignore the arrow pointing to the right) and take the street on the left. After a few dozen metres, at a forest barrier, turn right onto Allée de Vélizy (signposted) and follow the signs. You will arrive at the Rond-Point d'Ursine.
Without signposts
(3) Go around the roundabout on the right and take Route de la Fontaine (sign), which is the third road on the right. Keep to the left of a forest that is being regenerated after logging and continue to a crossroads at the edge of a pond (not named on the map). Take the path on the right (yellow sign with two sides). At the next crossroads, the path you have just come from begins a steep descent: leave this path and turn left (forest plot no. 91) onto the path that climbs up alongside a beautiful forest on your right.
Red and white markings
(4) At the top of the hill (forest plot no. 87), take theGR® on the left. At the next crossroads, take the second path on the left (turning slightly to the left). At a fork, take the left-hand path towards the Vélizy cemetery. At the next crossroads, continue straight ahead and follow the cemetery fence on your right. Go downhill until you reach a crossroads near the Etang du Trou aux Gants.
(5) Go down a few metres on the right and take the path on the left that runs alongside the pond (contrary to what the IGN map suggests, theGR® does not take the path along the dyke but the path closest to the pond's edge). Cross the pond's spillway. When you reach a reservoir (grilles), turn left (north-east, forest plot no. 80) onto the path that descends through a beautiful, thinned-out forest (do not take the path along the pond dyke, which would take you back the way you came). At the next crossroads (isolated oak tree on the left), continue straight ahead. At the next crossroads (forest plot no. 77 on the left), continue straight ahead. At the next crossroads (yellow sign with two sides), turn right (forest plot no. 76) and take a very steep path: the climb is steep but short.
No signposts
(6) At the top of the hill, leave theGR® trail that branches off to the left and continue straight ahead, heading east (yellow sign with two sides). Cross a path and continue straight ahead. Shortly before the Encoignure crossroads (houses visible on the right), at a double-sided yellow sign, take the path on the left (not marked on the map) that runs alongside a ditch (an old drainage system) on the left. Cross a tarmac road (no motor vehicles) and continue along the ditch, now on your right.
When you see an information sign (behind you), turn left to reach it and a second ditch with a masonry structure (former exit of the Aqueduc de la Grange Dame Rose, see information on the sign). Continue along the second ditch on your left until you reach a wider path. Turn left onto this path, cross the ditch and you will soon reach the Carrefour des Fonds de la Chapelle. Cross the crossroads (no motor vehicles) and continue along the path opposite (yellow signpost marked"PR®6"). You will reach the Chêne des Missions, located on the right and surrounded by pseudo-megaliths.
Yellow signposting
(7) Go around this group on the left, on the wooden path. At a platform wider than the wooden path, between the pseudo-menhir and a pseudo-dolmen, take a faint path heading north-west. Keep this general direction and walk through the undergrowth. Cross two perpendicular paths. Ignore a wider parallel path on the left and reach the Rond-Point du Pavé de Meudon (imposing radio tower).
(8) Start going around the crossroads on the left and take the first path on the left (forest plots no. 71 and 69). You'll soon reach a crossroads at the top of a steep descent, with a red and white marker on the left and a cross of the same colour on the right.
No markings
Leave the marked trail and take the path on the right (green dot). The path bends to the right and continues along the edge of the slope on the left. The path then begins to descend towards the Route du Pavé de Meudon (blue arrows on the tree trunks). Cross a very narrow path and continue north-west, staying close to the road on your right. At a junction, ignore a path that leads to the road on the right (forest barrier, "allée cavalière" symbol) and continue straight ahead. There are no more blue arrows and you will rejoin the road a little further on.
(9) Cross the road (be careful) and turn left to follow the road. Take the first left turn (forest barrier broken in October 2017) and continue to the second turn about a hundred metres further on. Then turn right onto the path that starts after a forest barrier. At the next crossroads, go through the gate with yellow and red-and-yellow markers on the posts and turn immediately left at the foot of a tree marked with plot number 64. Follow the hard-surfaced track.
At a fork, take the right-hand lane towards a kiosk. At the next fork, take the left-hand lane, still towards the kiosk. When you reach the kiosk, turn right onto a wide path. At the trellises of a fitness trail, turn left and head towards the forest gate leading to the Chaville cemetery car park you used on the way there. Continue along the paved road that descends alongside the railway tracks. Then take Rue Anatole France on the right, pass under the railway bridge and turn right one last time to reach Chaville Rive-Gauche station (S/E).
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Very difficult 
Easy 
