The entrance to the forest to access the car park is located at the Châtenay-Malabry roundabout, just before the Quick restaurant. Park along Route de la Mare à Chalot, after the bridge over the A86 and before the Carrefour des Quatre Arpents.
(S) Take the green forest road (south-east, first path on the left at the crossroads from the arrival road). Continue straight ahead, cross the Carrefour du Chêne aux Cartes and continue to the Carrefour du Marquis (230m).
(1) At this crossroads, take the first path on the left. Continue straight ahead, cross the next crossroads and go around the small Mare à Chalot. Cross the Route forestière Saint-Martin and continue to the Carrefour de la Châtaigneraie.
(2) At Carrefour de la Châtegneraie, take the first road on the right (south), Chemin des Violettes, until you reach the next large crossroads where there is a picnic area, ignoring the paths on the left and then on the right.
(3) At the T-junction, continue right for a few metres. At the next junction, turn left (west) onto the Carrières forest road. Continue straight ahead, cross the car park, continue on the Princesse road (south-west), cross a road and then a path. At the T-junction, turn left and you will reach a large roundabout with the Château Landon road.
(4) At the roundabout, take the Château Landon road on the right. Continue on this paved road, which turns right to cross the Igny road. Follow this road on the right (there is an information sign on the left at the intersection of this road). Go straight ahead, cross the Carrefour des Oiseaux and continue straight ahead until you reach the intersection near a pond.
(5) At the intersection, turn left onto Route de Saint-Georges. Continue straight ahead and cross Route de Noailles. After 250 metres, turn right onto the path towards Carrefour de Noailles. At the crossroads, head north on Route de Noailles (third road on the left). At the next crossroads, Carrefour du Copeau, turn onto the first road on the right. Continue to Carrefour de l'Obélisque. Then follow Route du Plessis Piquet (2nd road on the left) to return to the car park (S/E).
I really enjoyed discovering your website and the route you suggested in the Meudon Forest. As it was my first time following one of your routes, it wasn't easy to find my bearings, but it became clearer as I went along!