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Start in Buc at the Pré Saint-Jean car park. Please note: the car park has a free section and a Blue Zone section.
(S/E) Cross Rue des Frères Robin, the central reservation in front of the theatre, and take the narrow lane on the right. At the corner by the theatre, follow the GR®11 signposts (selective barrier).Walk alongside a secondary road, cross it and the River Bièvre, follow the river along its left bank, then switch to the opposite bank. Continue and head uphill to the right until you reach the turnstile, then turn left.
(1) Cross the RD938 road with care, passing under the arches of the Saclay Aqueduct (information board about this structure). Continue along the GR®11 and spot the first horses in the pastures.
(2) The GR® leads to the first stud farm: Le Haras de Vauptain; walk through it. On leaving, take the GR®11 to the right,
(3) Walk alongside the Bièvre, which has been ‘restored to its natural meandering state’. Head right towards Les Loges-en-Josas for about 100 m, then turn left at the wooden gate and leave the GR®11 200 m further on, at the corner of the wall. Head up the Sente de la Fontaine to the right (GRP® yellow and red markings), along a wall with a flight of 87 steps, until you reach Les Loges-en-Josas, then turn right onto the Grande Rue for about 60 metres.
(4) Leave the signposted route, turn left onto Rue des Haies and continue straight on along Allée des Côtes to the hospital: ‘Centre Pédiatrique des Côtes – cardiology – gastroenterology’.
(5) Turn right onto Chemin des Côtes Montbron, then right again onto a path leading to the second stud farm: Le Haras des Côtes.
(6) Follow the fence on two sides until you reach Rue du Trou Salé, turn left onto Rue de La Division Leclerc and continue to the roundabout.
(7) Look out for the 1945 ‘Serment de Koufra’ Liberty Marker and continue left along Rue de la White Cross until you reach the third stud farm: Le Haras d’Eloge. (Note the little play on words – we’re at Les Loges!)
(8) Continue straight on to the RD938 road, taking the dirt track over a small hill. Follow it to the right for 100 m. Turn left onto Rue Roland Garros, then take thefirst left onto Rue des Boulangers until you reach the Henry Roth roundabout; continue straight ahead along the “Villaroy aux Loges” track (white metal barrier).
(9) As you pass, you’ll see a kennel for breeding and training guide dogs on your left; when you reach a wild hedge, take the grassy path on the right. At the end of this path, turn left to go round Fort de Buc, then continue to the right, taking a 90° bend, until you reach Avenue Charles Quatremare.
(10) Cross the avenue and turn left. You’ll reach a bus park. Towards the far end on the right, look out for a footpath; go down the four steps and immediately turn left for 80 metres, then continue to the right along the garden fences at the edge of the woods for approximately 600 metres.
(11) Turn right into the Résidence Haut Pré through a green metal gate. At the second junction, turn left and stay on this main path (Allée Saute Vent, veering slightly left onto Place du Tricorne, then Allée Coupe Bise) until you reach Rue Georges Bizet and the fourth stud farm: Club Hippique du Haut-Buc.
(12) Walk past it and head down to the right along the Chemin de la Butte aux Vaches to the stud farm’s pastures. Don’t miss the Oak of Louis XIV on the left.
(13) Continue down to the left along the pasture until you reach the River Bièvre and the GR®11.
(14) Follow it to the right as far as the Pré St-Jean car park (S/E).
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