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Park in the car park on the right at the entrance to Maincourt-sur-Yvette (on the D58 coming from Levis-Saint-Nom and heading towards Dampierre). A word of advice: if you can, park in reverse, as this will make it less risky to leave, as the car park is very close to a bend.
(S/E) Head east and continue through the village towards the Mairie-Chapelle on your left. Take the first left, Chemin du Moulin. You will come to a crossroads.
(1) Immediately turn right onto theGR®11(red and white markings). Shortly afterwards, you will pass a wash house. Continue to the right after the small bridge and walk along the Yvette on your right. The path takes you past a pile of sandstone blocks on your left. Then pass in front of the Moulin des Roches mill below on the right and finally in front of asecond wash house on the left.
(2) At the fork in the twoGR® trails, follow theGR®1to the right. Pass between the horse paddocks. You will come to a gravel road, then a tarmac road (marked orange by the PNR). At the junction with the main road, turn left.
(3) After about 100 metres, take a path that climbs up to the right towards the Maison de Fer.
Shortly afterwards, turn left onto an esplanade offering a beautiful view of the Château de Dampierre. Return to the path and a little further on, pass the Maison de Fer on your left. Follow the tarmac road that passes a few houses and leads into the forest (marked PNR Orange andGR®1Red and White). Continue until you come to a small road, which you cross. About 200 metres further on, you will come to a path on the left. Take the very narrow one.
(4) Follow this path. It will take you back across the road. Follow theGR® and PNR (blue and white) markings. When you reach a fork in the path, take the path furthest to the right, which descends steeply. When you reach the road, follow it to the right until you reach the end (it is a dead end).
(5) Then follow the PNR path (blue and white markings) which takes you into the forest. Ford a stream (it may or may not be dry depending on the season). At the junction with another path, continue straight ahead (blue and white markings). Cross asecond stream (same as thefirst) and walk along it on your left. Cross it again further on so that it is on your right. The path continues along the edge of the forest and then between two fields.
(6) Take the path on the right that descends into the forest. Cross a small concrete bridge and continue to follow the blue and white markings as you begin a steep climb. Cross a small road and follow the road opposite, which passes through a place called Champ-Romery (blue and white markings). Pass between some beautiful houses and take the cul-de-sac opposite at the crossroads. Go to the end.
(7) Continue opposite on a path lined with electricity poles (blue and white markings). Enter the woods via a small path. Pass a small cemetery on your left and continue along a wider path that takes you back to the main street of Maincourt-sur-Yvette. Turn left to return to the car park a few dozen metres away (S/E).
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