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Departure: Viroflay-Rive Gauche station (RER line C and Transilien line P).
(S) When leaving the station, turn left (south) onto Rue Rieussec and head towards the church. Then take a small street to the left of the church, diagonally (Carrefour de la Fontaine then Rue de la Ferme, south-east). Follow the yellow-red markings, which turn right uphill into Rue Molière. At the end, turn left onto Rue Jean Racine. Finally, take the first right uphill, Rue du Chêne de la Vierge.
(1) At Chêne de la Vierge (a curious open-air oratory), cross the road and take a fairly steep climb diagonally to the right (still following the yellow-red markings, south-west).
On the plateau, the path joins a wide forest track. Follow it to the right (west). Stay on the marked path, which is flat. 100 metres further on, at Carrefour des Bertisettes, the path to follow is flat, roughly opposite diagonally to the right (west-northwest). Do not go downhill or turn left.
The path curves around (to the left) a sort of clearing planted with trees, high above the town, and leads to the Sablière viewpoint.
(2) Go around, still following the yellow-red markings. Leave the clearing by crossing a crossroads to the south (Chemin de Jouy).
At the first main road (Route des Célestins), leave the markings and turn left (east-southeast). Pass a first path and turn left again onto a forest road (Route de Chasse, white-red markings, north-northeast). After 250 metres, at the Carrefour des Trois Barrières, take thefirst right onto the Route forestière du Cordon de Viroflay (southeast).
After about 150m, take a path on the left (north-east), marked white-red, which turns right (east-south-east then south-east). Follow the markings, ignoring the paths on the right and left, and continue straight ahead until you reach a large road junction (D53) and tramway.
Cross the crossroads and enter the woods as soon as possible via a small path on the left (north).
(3) Immediately take a path on the right, northeast, which is not marked. After 250m straight ahead, cross another path and continue straight ahead; now the path zigzags, more or less south-southeast. You will come to a "ditch" or water collection ditch (photo): follow this ditch to the left (northeast).
(4) At one point, the channel forks. The right branch crosses the main channel and continues east, crossing Route de la Fontaine de l'Ursine. The channel passes under the road via a small bridge on your right, as well as an information panel. Follow this branch east. The path runs along this stream, eastwards, crossing several paths. When the stream goes underground, continue on the path in the same general direction (east-southeast) until you reach the Vélizy cemetery.
Go around the cemetery on the right to reach the white-red marked path (east-southeast) downhill to the Étang du Trou au Gants (photo; a good spot for a picnic).
(5) Continue along the white-red marked path alongside the dam, heading south-east. Then turn 90° to the left and descend north-east (Route du Cordon du Bas).
(6) At the next junction, turn right uphill onto Route de la Fausse Porte (east-southeast). At the top of the hill, turn left onto the tarmac road (Route du Cordon de Vélizy, closed to cars), northeast. After about 100 metres, take a path perpendicular to the left (north-west), which winds its way and eventually heads north-north-east. You will reach a forest road (Route du Cordon du Haut), which you take to the left and which winds its way (north-west then north then east and finally north-east). Pass a curious prayer space marked by white crosses on your right.
Halfway (from Carrefour du Précipice), the road becomes marked in white and red. This forest road eventually joins a paved road (closed to cars) coming from the left (Route des Fonds de la Chapelle). Continue straight ahead (northeast) to the large Carrefour des Fonds de la Chapelle. Turn right onto the Cordon du Haut forest road (north-west), marked in white and red.
(7) On the right is the magnificent Chêne des Missions oak tree, next to which is a fake menhir and a few fake dolmens, as well as a wooden walkway for wheelchairs.
Continue along the Cordon du Haut road, marked in white and red (north-west). Cross the Route de la Fontaine de l'Ursine and continue following the white and red markings (north, then north-west).
(8) At a crossroads, the forest road marked in white and red turns sharply to the right, while a yellow and red trail branches off sharply to the left. Continue straight ahead downhill, following the yellow markings to the north-west. 200 metres further on, in the hollow, the yellow markings turn to the right; continue straight ahead to the north-west.
Pass several paths, continuing straight ahead (north-west). Cross the tarmac road of Pavé de Meudon (cars). Take the road opposite, heading north.
(9) 200 metres further on (plot 65), turn left onto the yellow-marked path, heading south-west, slightly uphill. 200 metres further on, avoid the road and follow the yellow markings perpendicular to the right, heading north-west.
(10) At a fence, the yellow markings go to the right: continue straight ahead, slightly to the left, through the fence (west). At the end, turn left along the railway line. This will take you to Chaville-Rive Gauche station (main entrance under the bridge on the right) (E).
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Very difficult 
Easy 
