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Departure from Brunoy station (RER D). Take exit 2, Place de l'Arrivée.
(S) When you leave the square, turn right onto Route de Brie. Cross Rue des Vallées towards the Montaigne car park. At the end of the car park, follow the small path along the railway line (start of yellow markings).
Yellow and/or yellow and red markings
(1) Go under the viaduct, take the footbridge over the Yerres and turn right. Walk along the river on your right. At the playground on the left, notice the La Femme and La Fille de Loth menhirs (also known as Pierre Fritte) at the water's edge (in the other arm of the Yerres). Continue straight ahead until you reach the road, turn left and cross the bridge.
(2) At the end of the bridge, cross the road and go down the stone steps to reach the Yerres. Follow the river on your right. Further on, after crossing a wooden footbridge, turn left and go back down to the main path, keeping the water on your right. Go around the playground on the right and follow the path, keeping the river on your right.
(3) At the end of the path, cross the stone bridge on your right. At the end of the bridge, enter the park through the gate on your left and continue with the river on your left. Cross another wooden footbridge, then pass a small kiosk on your left. Continue straight ahead along the river. The path moves away from the river and arrives at the bottom of a small castle.
(4) Turn left and walk along a lawn and a small football pitch on your right. Leave the park by going under the railway bridge. You will rejoin the Yerres and walk alongside it on your left.
(5) At the fork that soon appears, take the left-hand path and cross the bridge with iron railings. At the end of the bridge, turn immediately right to cross a second bridge and continue along the left-hand path. Then leave the main path and turn left onto a new bridge with iron railings. Stay on the path and ignore the small hill on the left.
(6) When you leave the path, cross the avenue in two stages at the pedestrian crossings and leave a roundabout on your left. Cross the Réveillon and follow Rue Raymond Poincaré with the former royal abbey on your right. Follow its wall until you reach a traffic light. Turn right onto Rue du Clos des Abesses, then left onto Rue du Réveillon. Note the Val Ombré gate on your left, then pass under two archways and continue straight ahead towards the cul-de-sac. Follow the sign for "Promenade du Réveillon".
Yellow markings
(7) Cross the Réveillon and take the path along the river on your left. Cross the river again and continue to the right at the end of the bridge. Leave the orchard through the small gate and continue along the Réveillon, located on your right. At the fork that appears shortly afterwards, take the small uphill path on your left. Further on, descend again. At the bottom, join a path and follow it to the left. You will find the Réveillon on your right. Take a wooden footbridge parallel to the river. Follow the Réveillon on your right for a long time.
(8) At the fork under the high-voltage power lines, take the path on the left that leaves the river and climbs uphill. Pass under another high-voltage power line, turn left and continue climbing. At the top of the hill, walk along a fenced plot on your right and follow the path on the left at the end of the fence.
Yellow and yellow and red markings
(9) At the next three-way junction, take the left path (north). Pass a small gate, cross the road and continue straight ahead along the path that runs alongside a fence on the left (protected by CCTV). At the end of the fence, continue straight ahead and pass some abandoned greenhouses on the right. At the next small crossroads, continue straight ahead along the wide path (you can see a high gate in the distance that closes off the path). You will come to a large circular grassy square: L'Étoile de Bellevue.
(10) Go around this square on the right towards Boissy. Take the third path on the right, the Allée Royale, lined with two rows of trees. At the end of the path, cross the road and admire the Château de Gros Bois in the distance.
Yellow and red markings
Turn left onto the Tégéval, a very wide cycle and footpath (leave the yellow markings). Cross the D260 and continue straight on along the Tégéval. Take the second small path on the right, which leads into the forest. Continue straight ahead (north-west) and ignore the paths branching off to the sides. At a fork, turn left.
(11) At the next crossroads, turn left. At the next crossroads, take the middle road (west-northwest; markings on the left-hand side). At the next crossroads, take the first right (leaving the forest road). At the next crossroads, cross Chemin du Tertre and take the first path on the right. Walk alongside a housing estate and you will come to a tarmac road. Continue straight ahead, walking alongside sports facilities on your left, then a secondary school.
(12) Cross Avenue du Général Leclerc and follow the road opposite (there is a car wash on the left-hand corner). Continue straight ahead, passing the war memorial on your right, then the town hall, until you reach a crossroads (traffic lights).
No markings
Cross the D33 (Rue de Suçy) and take Rue de Paris. Follow this shopping street, crossing Rue de Wagram, Rue Valou de Villeneuve, Rue de l'Église and Rue de La Fontaine in succession. Continue along Rue de Paris, which slopes steeply downwards. At the end, cross Avenue du Général Leclerc in two stages. Continue straight ahead, then turn left to reach Boissy-Saint-Léger station (RER A) (E).
Visorando member
Easy 
