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The walk starts in Buc in the Pré Saint-Jean car park. Please note that the car park has a free section and a ‘Zone Bleue’ section.
(S/E) Head east, cross Rue des Frères Robin and the central reservation in front of the theatre, then take the narrow lane on the right. Follow the red and white markings of the GR®11 (selective barrier).Walk alongside a secondary road, which you’ll cross, as well as the River Bièvre.
(1) Turn right to follow the river along its left bank, cross over to the other bank and continue. Go round the pond on the left, then head up to the right until you reach the turnstile. Then turn left to join the D938.
(2) Cross it carefully, passing under the arches: there’s an information board about this structure. Continue along the GR® to the Vauptain stud farm, pass through it and cross the Bièvre again.
(3) Turn right and follow the meandering, renaturalised river. Join a road, turn right towards Les Loges-en-Josas for about 100 m, then turn left at the barrier.
(5) Head up to the right along the Sente de la Fontaine (GRP® yellow and red markings), alongside a wall with a flight of 87 steps. Once in Les Loges-en-Josas, take the Grande Ru to the right, then the Rue des Haies to the left, leaving the marked trail.
(6) Turn right onto the Chemin des Écoliers (library, nursery), continuing after crossing a car park and the Rue Guy Mocquet. The path resumes almost directly opposite, with a slight offset of 10 metres to the left, and eventually leads onto the Rue de la Garenne. Turn left onto this road until you reach the roundabout: note the 1945 Borne de la Liberté.
(7) Carry on straight ahead along Rue de la White Cross, cross the industrial estate and pass the Éloge stud farms. Continue straight on until you reach the D938, turning left onto the dirt track over a small hill.
(8) Turn left to follow the road along the cycle path for about 300 metres. Cross the D938 carefully, turning right about a hundred metres after a detached house, and follow the path that runs alongside the Étang du Pré Clos. Enter the wooded area and, just before the gate, head up to the right onto the grassy embankment. Stay on it until you reach the low-lying monument marking the site of a fatal accident involving an aviation pioneer. The pilot Louis Massotte (1906–1937), nicknamed ‘Ace of Hearts’.
If the path is too overgrown, cross the embankment, walk along the bottom of it almost as far as the wire fence, and look out for the small sign pointing to the monument on the embankment. Climb up to the right until you reach it.
(9) From here, head down to the left and make your way to the Henry Roth roundabout. Turn left onto the Chemin de Villaroy aux Loges: there is a white metal gate. As you pass, you can see a breeding and training kennel for guide dogs on the left. You’ll come to a junction opposite a wild hedge.
(10) Take the grassy path on the right. At the end of it, turn left (you are behind Fort de Buc), continue with a 90° right-hand bend and go straight on until you reach Avenue Charles Quatremare.
(11) Cross the road carefully as there is no pedestrian crossing, then turn left towards a bus park. Head towards the far end on the right, find the path, go down four steps, then turn left and enter the woodland.
(12) Turn left at the junction. Then take the path on the right leading down towards the Bièvre; cross the river after passing a main road called Route des Prés de Buc. You’ll come to a star-shaped crossroads and rejoin the GR®11.
(13) Continue diagonally to the right, skirting the Étang de la Geneste. Turn right at the far end of the lake and cross the Bièvre again.
(14) Immediately afterwards, take the steps up to the path on the left to walk along the right bank of the river as far as the tennis courts.
(15) Cross back to the left bank to return to the Pré Saint-Jean car park (S/E).
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