Country:
District:
Starting point and access: Guichet station.
- RER - Line B, on the section between Paris and Saint-Rémy-lès-Chevreuse.
Take exit 2 Rue de Versailles, at the rear of the train on track 2, travelling from Saint-Rémy-lès-Chevreuse to Paris (if arriving in the opposite direction, on track 1, go to the front of the train and take the underground passage).
No signage
(S) When you leave the station, head left, go through a metal gate and turn right at the corner of a bar-restaurant. Immediately turn left into Rue Vaubien and go uphill. At the crossroads, continue up Rue Vaubien, slightly to the left. At the end, turn right onto Chemin du Merisier Noir. At the next crossroads, turn left onto Rue de la Colline, which climbs gently at first and then becomes steeper towards the end. This leads onto Chemin du Bois des Rames; follow this road to the right. Walk alongside the Le Coteau residential complex on your right, then a car park on your left. Take thefirst left after the car park.
Yellow markings
(1) Immediately turn left onto Route du Plateau. Pass a bus stop and, at the fork that appears immediately, turn right. At the next junction, turn right onto Rue du Belvédère.
No markings
When the street turns right, continue straight ahead, pass a forest barrier and follow a dirt track. Cross a cemented stairway and continue for another 50 metres or so.
(2) Then turn right and climb a sort of earthen step (be careful to spot this starting point). Follow a path that winds through the undergrowth and is not shown on the IGN map. Return to a tarmac road, follow it to the left and walk alongside the Institut d'Optique on your right.
Yellow markings
When the road turns right, continue straight ahead, pass a forest barrier and take a path. Follow this gently sloping path through the woods for a long time, heading west then west-southwest, and ignore any tracks and paths on either side. At a three-way junction (plot no. 29), take a sharp left turn.
No markings
After about 100 metres, turn right between two trees marked with the number 29. Go down a path, which leads to a wider track, and follow it to the right. Pass through a forest gate and follow a track to the right that runs parallel to a road. Cross the road atthe first pedestrian crossing and follow it on the left-hand pavement.
(3) At the stop sign, take thefirst left, Rue du Docteur Collé, and go downhill. Walk past a secondary school on your left, then a primary school. Cross the Yvette river and continue straight ahead at the foot of a university residence on your left. At the roundabout, continue straight ahead towards the town centre, follow the road on the right-hand pavement, along a branch of the Yvette river. Go around the next roundabout on the right, cross the D95, turn left and leave the "Grande Maison" on your right.
(4) Go through a metal gate on the right and enter the Parc de la Grande Maison. Continue straight ahead and ignore two paths on the left. At the next crossroads, continue straight ahead. Shortly afterwards, turn right and stay on the paved path (ignore the grassy path opposite). Walk alongside a small pond on your left. At the end of the path, ignore the steps on either side and take the exit in the park wall.
Yellow markings + red and green arrows no. 36
N.B. In two places, the numbers have been reversed by mistake, so you will see 63 instead of 36.
(5) Come out onto a street, follow it to the left uphill and immediately turn right onto a tarmac path that passes under the railway line. On the other side, turn right onto the tarmac path. At the end, cross a street-car park and first turn left then right to enter a footpath (chicane). Follow the path, which alternates between left and right turns between garden fences. Cross a river and come out onto a perpendicular street.
(6) Follow the street to the left and, at the end, take a path that starts between numbers 7 and 8. Walk along the right-hand side of a grassy area with wooden equipment. Come out onto a street and follow it to the right. Cross Rue de Gometz on the left-hand side (ignore a yellow arrow indicating a left turn; twoPR® trails separate here). Continue straight ahead on Avenue du Trianon, cross Avenue des Violettes and climb steeply.
Red and green signpost no. 36
(7) At the T-junction, turn right and climb more gently. Turn left with the street. Leave it immediately afterwards, when it turns right, and climb a steep staircase on the left. At the top, continue along a wide gravel path (Avenue Gutenberg). Take thefirst right, Avenue Carnot. At the next junction, turn left, cross Avenue Vigny and follow Avenue Faidherbe. Cross Avenue Corneille on the left-hand side.
Blue markings + red and green arrows no. 36
(8) At the corner of no. 7, turn left onto Chemin de la Coudraye and follow the path between the garden fences. At the end (beautiful oak tree opposite, plot no. 82), go through a forest gate and enter the Gif-sur-Yvette forest. Continue straight ahead (west) on a stabilised path and ignore all the side paths.
Blue + yellow markings
At the crossroads at the foot of a Laricio pine tree described as "good-natured", continue straight ahead (west). Ignore any vague turnings off to the sides and cross a few streams.
(9) At the crossroads (map), ignore one path on the right and two on the left. Pass through a chicane and take a small tunnel under a road.
Blue + Red and Green Markings No. 36
On the other side, ignore a path on the left and continue straight ahead. At a wooden marker, turn right onto a path not shown on the IGN map towards a viewpoint. You will soon reach it.
(10) Continue along the path that curves to the left.
Yellow markings
At the end, continue along a stabilised path roughly parallel to a street on the right. Walk along a fenced pond on your right. At the end of the path, cross a street (small car park), pass a chicane and take a cement path towards Bois Carré.
No markings
(11) At the end, turn right towards Chevry-centre and go around a school on the right. After a left turn, pass a chicane on the right and continue along a cement path. Walk along a shared handball/basketball court on your right, then a rugby field. When the cement path veers to the left, continue straight ahead through the grass. At the corner of the field, find a cement path and follow it to the right. Go straight ahead, ignoring the paths on the left. Come out onto a street (garage opposite) and follow it to the left. At the roundabout, turn left. Cross Allée de la Bergerie on the left, continue along Rue de Chevry and you will reach the church.
(12) Then turn right to cross the street, first turn left then right at the foot of the town hall annex to follow a path towards a well-known bank branch.
Yellow markings + red and green arrows no. 6
At the corner of the bank branch, turn right. Go down a flight of steps and go through the gate to the grounds of the Château de Belleville. Turn left immediately. Then take thefirst path on the right and go around the château on the left. At the corner of the building, continue straight ahead and cross a lawn with trees. Walk along a pond on your right and, at the three-way junction, turn left. Cross a vague path and go straight ahead. Leave the park, follow a street on the left and pass under a medium-voltage power line.
(13) At the crossroads (signposted "La Gruerie"), go straight ahead towards La Folie-Rigault. Then take thefirst left. At the end of the tarmac road, continue along a farm track between two fences. At the T-junction, follow a grassy path to the right. Walk alongside a field on your left and, on your right, a fenced meadow and then a wood. At the corner of the wood (elevation 156), continue straight ahead between the fields. At the next junction (stone marker on the left), follow Chemin de Saint-Rémy straight ahead.
Red and green signpost no. 6
(14) At the next intersection (large house on the right), go straight ahead. Facing a metal gate, turn right and walk along a fenced meadow on your left. Enter the woods and go downhill. At a fork (not shown on the IGN map), turn right and continue downhill on a sunken path. Then walk along the wall of a property on your right. Further on, ignore a path on the left and walk along garden fences on your right.
No markings
(15) Go through a forest gate and continue along a tarmac road (Rue Henri Janin, signposted further on). Go downhill and cross Avenue Albert on the right, then Avenue Marthe. At the crossroads, take thethird right, still on Rue Henri Janin. At the next crossroads, turn right, immediately cross Avenue de la Terrasse and continue straight ahead. At the traffic lights, turn right and you will soon reach Saint-Rémy-lès-Chevreuse station (E).
To return home:
- RER - Line B, towards Massy-Palaiseau and Paris.
) and in any case you quickly leave the main path to go uphill. The exit of the path is still cluttered with rubble and construction equipment, but there is plenty of room to pass.
Visorando member
Easy 
Association / Club / Walk leader
Very difficult 
Difficult 
