Between Buttes and Vallons

Departure: in Bonnelles park in the sports center car park.

1. Exit the car park and at the intersection turn right. Keep going straight on this street, then at the roundabout take the opposite direction in the direction of "toutes directions" via the Chemin des Clos.

2. At the D 988, cross it and take the dead end opposite, then turn immediately right by the dirt road which crosses the fields and always follow straight (you are on the GR, marked red and white ).

3. After the chapel on your left, you pass two successive bridges: pass the barrier and then continue straight ahead on this marked path GR to the road.

4. At the road on the left then at the fork again on the left following the GR.

5. At the end of the street, at a water pump, turn left on the GR, then at the next intersection right on the GR 655. Continue straight on this road until you reach the edge of the forest .

6. At the edge of the forest, turn right along the path and follow it straight ahead: you will soon be skirting the Haras de la Cense estate on your right.

7. At the fork, continue to the right, still skirting the stud farm. Soon you will see the buildings: go to the end of the path.

8. At the end of the main building, turn left on the wide path that you do not leave until you reach the road.

9. Take the road to the right, then down the road at the entrance to Rochefort to the right again, then the first path to the left (Chemin de la Garenne). Option: at the bottom of the road at the entrance to Rochefort you can turn left for
visit this town.

10. You cross the D 988 on a footbridge, always follow this main sandy path. Further on you pass a property on your right, then the path leads to a road.

11. At the road turn left. You arrive at Moutier on the Yvelines road which you take to the right in the direction of Bullion. (Option: turn left at the Yvelines road then right at the crossroads and discover the Sainte-Anne chapel).

12. After the bend, at the level of the pedestrian crossing with a bus stop, take the path on your left (Chemin des Brodernes). You enter the forest, leave a path on your right and at the fork, follow the right path until you reach a large crossroads.

13. At the big crossroads, turn right along the grassy path, you will soon be on the edge of the forest (in the background, you can see the Carneaux farm). Continue this path straight downhill to the road.

14. At the D 61 turn right and enter Les Carneaux where you will take the first left towards “ferme des Carneaux” and pass the “Moulin Béchereau”.

15. Arrived in front of the sign "Foret départementale de Ronqueux", leave the road and take the path on your right. Leave the path on your left behind a barrier, to continue straight on this path to a fork.

16. At the fork turn left on the path that goes up marked PNR (blue and white): follow it to the D 149.

17. At the road, cross it to take the path opposite, following the PNR markings. You will cross the fields downhill, then catch up with another road. On this road to the left, then immediately to the right by the "Clos du Puits" (caution: road in the wrong direction) always following the PNR markings.

18. You cross the houses: take the first path on the right which crosses the forest, signposted PNR and do not leave this main path until you arrive at the Pony-club.

19. Arrived opposite the Pony-club join the road on your right, then the road on the right until the D 132. At the stop sign leave the PNR markings and turn right on the D 132. Follow this road always straight ahead management of Bullion. At the roundabout straight ahead until the stop sign.

20. At the D 149 turn left towards Rochefort, then at the small embankment on the left on the chemin du Pipeu which you go straight up until you reach the forest. Then continue along the path and cross the footbridge. Take the path opposite (Follow the PNR markings).

21. You encounter a steep climb then you cross a muddy plateau, then you come to a rocky descent. Stay on this main path until the D 988.

22. Arrived near the road do not join it and opt for the grassy path on your left which passes through the field. Follow this path to Osmonds Stables.

23. At the stables, take the chenin on your right which runs along the wall of the nature reserve.

24. Arrived on the road opposite a treatment plant, turn left and 85m further on take the path on your right which climbs through fields and which runs along a wood.

25. At the junction, turn left then take the D 988, cross it again and enter Bonnelles. Then always straight on the same way as on the outward journey. You are back.