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Start from Orsay-Ville station (RER B). Take the ‘Faculté’ exit (on the side heading from Saint-Rémy-lès-Chevreuse towards Paris; if arriving from the opposite direction, use the underpass).
(If you’re travelling by car: there is a car park below the station, at the junction of Rue Elisa Desjobert and Rue Jean Teillac / Rue de Launay)
(S/E) Walk down Rue Elisa Desjobert. At the junction, turn left onto Rue de Launay. You’ll come out onto Rue Jean Teillac; follow it to the left.
Then take thefirst left onto Avenue Irène et Frédéric Joliot-Curie. At the Fork in the road, turn right, staying on Avenue Irène et Frédéric Joliot-Curie. Stay on this road, between building 100a on the right and buildings 102 and 101 on the left. Then pass between building 100 on the right and building 108 on the left.
(1) At the end of the avenue, rejoin Rue Jean Teillac and follow it to the left. At the Fork in the road, turn right to stay on Rue Jean Teillac. After building 207, continue along Rue André Ampère. Head more or less straight on alongside the Linear Accelerator Laboratory (LAL).
At the corner by 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) As you come off the bridge, keep left at the fork and leave a body of water on your right. At the next two junctions, continue straight ahead. You’ll come out onto Rue du Doyen André Guinier; follow it 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 to the right between buildings 338 and 337. At the next junction, turn left to walk round the back of building 337.
Follow the path for 200 metres, passing a pond and then an equestrian centre on your right. Continue along the path, then turn right onto the Chemin de la Fontaine Saint-Mathieu, which then becomes the Rue de la Fontaine Saint-Mathieu. At the end, carefully cross the Rue de la Guyonnerie and turn right onto the path that runs alongside the street. At the first junction, turn left onto the path climbing up the hillside. At the next junction, go right for 20 metres and continue left, heading due north. Join a cross-path.
(4) Head left for 50 m, go up to the right, then right again for 50 m and head left, due north, to the top of the hill opposite the Centrale Supélec buildings (black and green building).
(5) Turn right onto the path running along the hillside. Continue along this path, passing behind the building and then past two car parks.
(6) At the junction, turn left and walk up Rue de Broglie for 100 metres, passing the Gallo-Roman villa “La Mare Champtier”. Turn round.
(6) Follow Rue de Broglie to the left for about 400 metres. At the Fork in the road, turn right onto Rue André Rivière. Go straight on and walk along the right-hand side of the Solid State Physics Laboratory (Building 510), a cross-shaped building with black façades.
At the corner of the building, turn right onto a path and walk round the front of the same building. Then turn right onto Rue du Belvédère. After less than a hundred metres, leave the street and turn left onto the path leading down into the Bois des Rames.
(7) At the junction, turn left onto the path that leads down more directly. Follow the path straight down to a flight of steps leading onto Rue du Doyen Joseph Peres. Cross the road carefully and follow the path opposite as far as Rue de Chevreuse.
(8) Cross the road carefully and re-enter the campus via Rue du Château. At the T-junction, turn right, staying on Rue du Château. This street curves sharply to the left and passes in front of Building 300 (the Château).
At the next bend, continue downhill along a path on the left, then immediately turn right. At the bottom of this path, go round the campus gate, which may be closed at weekends. Cross the River Yvette and rejoin Rue Élisa Desjobert. Follow this street straight on until you reach the Orsay-Ville RER station (direct access towards Paris; take the underpass if heading towards Saint-Rémy-lès-Chevreuse) (S/E).
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