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Departure from Orsay-Ville station (RER B). Take the "Faculté" exit (on the Saint-Rémy-lès-Chevreuse to Paris side; if arriving in the opposite direction, take the underground passage).
(If you are travelling by car: parking is available below the station, at the intersection of Rue Elisa Desjobert and Rue Jean Teillac/Rue de Launay).
(S/E) Walk down Rue Elisa Desjobert. At the crossroads, turn left onto Rue de Launay. Turn onto Rue Jean Teillac and follow it to the left.
Then take thefirst left, Avenue Irène et Frédéric Joliot-Curie. At the fork, turn right, still on Avenue Irène et Frédéric Joliot-Curie. Stay on this road, between buildings 100a on the right and 102 and 101 on the left. Then pass between building 100 on the right and 108 on the left.
(1) At the end of the avenue, find Rue Jean Teillac and follow it to the left. At the fork, turn right to stay on Rue Jean Teillac. After building 207, continue on Rue André Ampère. Go almost straight ahead along the Linear Accelerator Laboratory (LAL).
At the corner of a car park on the right-hand side, and just before a football pitch, take a path on the right. Turn right to cross the Yvette.
(2) At the end of the bridge, keep left at the fork and leave a pond on your right. At the next two intersections, continue straight ahead. You will come out onto Rue du Doyen André Guinier; follow this road to the right. Walk past building 332/333 and then a car park.
(3) At the foot of building 338, climb the few steps on the left, then turn immediately left onto the path. Pass between buildings 338 and 337 on the right. At the next intersection, turn left to walk behind building 337.
Follow the path for 200 metres and walk along a pond on your right. At the equestrian centre, turn right onto the road leading to the horse quarry. At the end, carefully cross Rue de la Guyonnerie and, turning left and then right, take the path opposite that climbs up the hillside. At the next junction, turn right for 20 metres and continue left, heading due north. Join a cross path.
(4) Turn left for 50 metres, climb to the right, then right again for 50 metres and turn left, heading north to the top of the hill opposite the Centrale Supélec buildings (black/green building).
(5) Turn right onto the path running along the hillside. Continue along this path, passing behind the building and then two car parks.
(6) At the crossroads, turn left and walk up Rue de Broglie for 100 metres to pass in front of the Gallo-Roman villa "La Mare Champtier". Turn around.
(6) Follow Rue de Broglie on the left for about 400 metres. At the fork, turn right onto Rue André Rivière. Go straight ahead and walk along the right-hand side of the Solid State Physics Laboratory (building 510), a cross-shaped building with black facades.
At the corner of the building, turn right onto a path and walk along the front of the same building. Then turn right onto Rue du Belvédère. After less than 100 metres, leave the street and turn left onto the path that descends into the Bois des Rames.
(7) At the crossroads, turn left onto the path that descends more directly. Follow the descent straight ahead until you reach a staircase that leads to Rue du Doyen Joseph Peres. Cross the road carefully and follow the path opposite until you reach Rue de Chevreuse.
(8) Cross the road carefully and re-enter the campus via Rue du Château. At the T-junction, turn right, still on Rue du Château. This street makes a wide left turn and passes in front of building 300 (the Château).
Leave the street and go down a path on the right. At the end of the path, continue straight ahead on the road. Go through the campus gate, cross the Yvette river and you will find yourself on Rue Élisa Desjobert. Continue straight ahead on this street and you will find the Orsay-Ville RER station (direct access to Paris, take the underground passage to Saint-Rémy-lès-Chevreuse) (S/E).
Visorando member
Moderate 
Association / Club / Walk leader
Very difficult 
Difficult 
