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Park in the Petits Ponts car park, the entrance to which is opposite 36 Rue de Rambouillet (D906), along the Yvette river.
(S/E) Join the Chemin des Petits Ponts via the north-west pedestrian exit of the car park. When you reach the Yvette river, turn right.
After the wash house, turn right to follow the Yvette and pass in front of the old skin drying shed. Continue to athird street (Rue de l'Yvette).
(1) Cross the bridge to continue along the Yvette.
At the end of the road, turn right. Don't miss the Château de la famille de Coubertin (Olympic Games) on your left, which is unfortunately not open to visitors.
(2) At the crossroads, take the path opposite to pass in front of the Coubertin farm. When you reach the TV pylon, start climbing the path opposite (this path is often very muddy, especially after rain; if this is the case, take a small path that runs alongside it on the right-hand side).
(3) When you reach a wide forest lane, turn right.
Pass three paths on your left, then turn left onto a wide forest lane at plots 14-15 and 19-20 (numbers indicated on the trees).
(4): After about 100 metres, pass a forest shelter, continue straight ahead, cross the road and continue straight ahead.
Pass the Château de Méridon, now a reception centre.
After the château, turn right onto a wide forest lane in the undergrowth.
(5) Follow this lane to a fork, where you will take the forest lane diagonally to the left (not completely to the left).
Continue to the village of Herbouvilliers. Take the road to the crossroads (water point) and turn right onto Rue de l'Abreuvoir.
At the next crossroads, turn right onto Impasse des Tilleuls.
(6) After the paved section, take the small road on the left that goes downhill and follow it to a crossroads where you continue straight ahead uphill.
(7) You will arrive at Château de Breteuil, which you can admire from the gates (a visit may be too long given the distance you still have to travel).
Continue straight ahead, along the wall of the castle grounds.
Be careful, you will then come to a fairly dangerous descent (irregular and slippery rocks) which must be approached with caution.
(8) Continue uphill until you reach the road in the village of Choisel, then turn right.
Stay on the road and turn left at the first crossroads.
Before reaching the D906, take a path on the left and then right to cross the D906 with caution.
Continue along the road and leave a path on your right to arrive on the left in front of the Malvoisine equestrian centre, a former fortified farm.
(9) In front of the centre, take the path on the right until you reach a fork.
(10) At the fork, take thesecond road on the right, downhill.
Continue along this road, straight ahead, until you reach the road (village of Senlisse), which you will take on the right.
Continue along the road, passing the Moulin d'Aulne (now abandoned) and arriving at the D91.
(11) Take this departmental road on the right. Cross it and take the pavement on the left (shelter and water point).
Follow the D91 to the village of Dampierre (unfortunately, there is no other option but to follow the fairly busy road for a few hundred metres).
Once you reach the centre of the village, you will find places to stock up on supplies, eat and drink.
(12) Continue to the castle, then take the path that climbs up to the esplanade opposite the castle.
When you reach the top of the path, don't forget to turn around to admire the view of the castle.
Continue straight ahead until you reach a street (Rue Pierreuse), which you will take to the right, downhill.
When you reach the road (D58), turn left.
Then take the first street on the right (Rue de Châtillon) and pass the Moulin de Châtillon equestrian centre.
Cross a stream
(13) After the stream, when you reach a fork, turn right and leave a path on your right just after, until you reach a paved section.
(14) Take the road opposite (Rue du Belair).
Continue straight ahead on the road to cross the village of Mesnil Sevin.
When you reach the road (D13), cross it carefully and take the path opposite, across the fields.
When you reach the paved section, continue straight ahead and take thesecond street on the right (Rue de la Ferme).
(15) Cross the D91 with caution and continue straight ahead on Route de la Madeleine. This road is generally quiet.
Continue straight ahead on the road until you reach the Carrefour de la Madeleine (yellow signs).
(16) Turn left onto Chemin Jean Racine and continue until you reach Carrefour de Roi de Rome.
(17) Turn left. At thefirst fork, take the road diagonally to the right and continue on this road (always straight ahead) until you reach the road (Chemin de Milon) at a forest shelter.
(18) Turn right onto the road (not very busy) that crosses the fields.
When you reach the first houses, pass two roads (one on the right and one on the left) and at the crossroads, turn right onto Route de la Brosse.
(19) When the road curves to the right, turn right after the car park onto the wide path on the left, towards Maison du Parc (do not turn completely left under a porch - private property). There is a water point under the trees.
(20) You will arrive at Château de la Madeleine, which you can visit if you wish (it is about a 15-minute walk to complete this hike). Don't miss the view of Chevreuse and its valley.
Continue past the château and take the path down towards Chevreuse; you can then take the steps or stay on the path.
At the fork, stay on the paved road to the right.
When you reach Rue de Versailles, turn left and then right at the market square.
Take thefirst street on the right, Rue de l'Église, to visit Saint-Martin Church and admire its original ambulatory.
When you leave the church, return to the market square and turn right onto Rue Lalande.
Turn right, then take thefirst street on the left, Rue des Mandars (water fountain).
Cross the bridge, then turn right and finally left to reach the car park where you can enjoy a well-deserved rest (S/E).
If you came by RER B, turn left after the bridge, at the wash house, and follow the directions at the beginning. When you reach the Coubertin farm, turn left to reach the Saint-Rémy-les-Chevreuse station via the cycle path.
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Moderate 
