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Departure point and access: Breuillet-Village station.
- RER - Line C, on the section between Paris and Dourdan.
Take the exit on the side of the platform corresponding to the direction from Paris to Dourdan, at the end of the train (if arriving in the opposite direction, use the subway).
Red and white signposting
(S/E) Follow the main road (D19) for just a few metres, then turn right into a small street towards an imposing building (Le Moulin cultural centre, in a former watermill). Cross the River Orge and note the waterfall on the right that once powered the mill.
(1) Turn left and, immediately afterwards, turn right onto a track that climbs between fields. The bell tower of Breux church comes into view as you descend towards the village. At the bottom of the descent, turn right-left and follow the Rue du Moulin (do not follow the red and white arrow pointing towards Saint-Chéron). Cross the Renarde (signposted "Saint-Yon" on the other side) and continue up the street.
(2) Cross the Rue de Villeconin (D82) and continue uphill. At the next T-junction, turn right-left to take a staircase that leads to an information panel. From the sign, follow a track to the left and then immediately turn right onto Chemin de la Folie, which climbs up into a wood. Ignore the start of a path on the left, then come to a marker with a path leading off to the right (Chemin des Cavaliers). Ignore this path on the right, continue straight on and reach the Porte des Bourdeaux.
(3) Pass under the gate and enter a small square where the church of Saint-Yon stands.
(4) Retrace your steps back to the Porte des Bourdeaux.
No signs
(3) Take the Chemin de la Porte des Bourdeaux, which goes off to the left (when you come back from the church) at the Porte. The path starts out more or less flat and then descends steeply into the woods, with outcrops of millstone in places. At a crossroads, continue straight ahead (signposted). The path becomes flat again. Near houses, at a place called Feugères, find the Chemin des Cavaliers from the right. Continue south-west alongside the houses. You will come to a crossroads with the large gate of a private property opposite.
Yellow markings
(5) Take the path that starts to the left of this gate, with a "No Rubbish" sign on the left. Head south then south-south-west, staying on the main path with the wall and fence of the property on your right. Along the way, note the Château de Segrez on the right.
(6) After a forest fence, you will find the GR®1, which comes from the left, and the Red and White markings will briefly overtake the Yellow markings. A few dozen metres after the junction with the GR®1, at a high white gate on the left of the road, turn right. The tall church of Saint-Sulpice-de-Favières comes into view. Arrive at the chevet of the church, go around it to the left and end up in front of the church façade (as you pass, leave the GR® heading east towards Mauchamps).
(7) With your back to the front of the church, turn right (at the corner of the square and a street, there is a representation of a Virgin and Child). Turn into the street (signposted "Circuit Hurepoix 1") and walk past the town hall. Then take the first street on the right. When this road bends to the left, level with a car park, continue straight ahead on a level track. At the next crossroads, continue straight downhill (playground on the right).
(8) Cross the D82, follow the meadows and cross the Renarde on a footbridge without railings. Enter undergrowth (wet passage), walk along a fence behind which you can see a pond and climb back up along horse pastures. At a fork in the road, level with a horse training arena, take the left-hand lane and head towards a large white house.
(9) At the crossroads, turn left (ignore the GR® markers opposite and to the right). Cross a small road and continue straight ahead on a track that alternates between meadows and woods. The Moulin de l'Écurie can be seen in the distance on the left.
(10) When you come to a fence with the mill in plain view (wireless electricity pole), keep to the right and walk along the fence on your left. N.B. Many walkers have reported the presence of very noisy and aggressive dogs on the other side of the fence. This passage may therefore be a little intimidating... The path winds through undergrowth, skirting rocks from place to place: stay close to the fence. When the fence veers off to the left at a right angle, do not continue along the path opposite (sandstone marker) but take a right-left turn onto a wider path. Continue south-west through a wood marked by recent clearings.
(11) Go through a forest fence and along a tennis court. Continue along a small road that leads to a private property. The road ends in a street lined with houses. Pass a wash-house, a landscaped recreation area, the town hall and a car park, all on the left.
(12) Just before No. 2 in the street, turn right into the Sente de la Rablennery (be careful, the start of the path is discreet; if you reach the Grand Rue, turn back). Climb between garden fences and take a few steps down into Rue des Roches, opposite a small church.
(13) Cross the road and take the path opposite, leaving the church on your right. Weave your way between two horse pasture fences. Emerge onto a wider track and follow it to the right. Ignore a track that goes off to the left behind a forest fence and rejoin the D132 road. Follow the road to the left for around 100 metres(take care).
(14) Just above a high-voltage power line, turn right onto a track that leads off the road into a wood (there are no markings here). Ignore the start of a track on the right, go along the wood (on your right) and a small field (on your left). At the end of the field, continue straight ahead on the path that climbs into the wood. Near the road, you will come to a place called Bois-des-Roches. Continue straight ahead on a faint path along a fence on your right. At the foot of a small water tower, turn left to rejoin the road.
(15) Follow the road to the right and pass a house with ochre rendering. When the road bends to the left, continue straight ahead on a track between fields (electricity pole with yellow marker).
Red and white markings
(16) At the crossroads, continue straight ahead on the small road, heading due north. Pass the Les Roches campsite on the left. Just before the entrance to another campsite, Héliomonde, turn left onto a track that descends steeply into the woods. Go through a forest gate and emerge into a street (houses).
(17) At the bottom of the descent, at a T-junction, turn right-left: follow the GR®111to the north-east (Chemin des Champs Queux) and leave the GR®1heading east. At a fork, still in the housing estates, choose the right-hand lane. The path, which initially runs north-east then east, alternates between field edges and undergrowth (note the sound of the waterfall of an old mill on the left). When you reach a road with a sign for "Breux-Jouy", turn left onto this road.
Unmarked
(18) Just before the bridge over the River Orge, with green railings, turn right onto a path and follow the river on your left. Finish this short stretch by walking along the wall of a house to reach the Rue des Douves, with another bridge with green railings.
Yellow markings
(19) Cross the Rue des Douves and continue along the Orge, on a narrow path bordering a meadow. At a crossroads (level crossing on the left, away from the Orge), continue straight ahead. Find the Orge on your left and follow the houses on your right. Reach the old mill (waterfall) at Petit Brétigny.
Red and white signs
(1) Turn left, cross the Orge, walk alongside the "Le Moulin" cultural centre and quickly reach the station (S/E).
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