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Departure from Boissy-l'Aillerie station (Transilien line J, on the section between Paris-Saint-Lazare and Gisors). Head towards the only exit, Place de la Gare, on the side of track 2 (if you arrive on track 1, take the footbridge).
Yellow signposts
On this route, twoPR® trails, both marked in yellow, cross each other several times. They are designated JC5 and R8, respectively: always follow the JC5 trail (JC stands for Jules César).
(S/E) When you leave the station, turn right, pass a hiking map on your left and walk along the car park. At the crossroads (war memorial), turn right and cross the railway line at the level crossing. Immediately turn left onto the D92 towards Pontoise.
(1) Cross two branches of the Viosne (an old mill) and then turn right with the road.
(2) At the fork, take the Rue Raspail on the right and go uphill. At the calvary, turn right with the road, which soon gives way to a path that enters a wood. At the end of the wood, ignore the path that branches off to the right and continue south-west between the fields.
(3) At the foot of a solitary tree (signpost), turn left. Pass between the fences of the inter-communal cemetery, then follow a hedge on your left with the cemetery beyond. You will come out onto a road; follow it to the right uphill for about 100 metres.
(4) Then turn right onto Chaussée Jules César (signposted), which starts as a cement track. When the track turns left, continue straight ahead, pass some concrete blocks and then a forest barrier and follow a shaded path. Walk through the undergrowth, keeping west-northwest.
(5) At a junction with a path coming from the right (the path on the left at 90° shown on the map does not exist), continue slightly to the left. Go downhill and take a hairpin bend to the left. At the end of the woods, turn right and follow a fenced meadow on your right. The path becomes narrow and surrounded by vegetation. After a clearer section, you will come to a small road.
(6) Cross the road and follow the wide gravel path opposite (still on the Chaussée Jules César). Pass the metal cross (Croix Justice) and descend. Cross a small road and climb up opposite onto the Chaussée Jules César, which is now a grassy path. At the crossroads (Croix de Labathe, a stone cross on the left), continue straight ahead and descend into the undergrowth.
(7) At the crossroads at the bottom of the descent, turn right at an acute angle and follow a fence on your left, through the woods and then along the edge of the forest. At the gate, turn right and follow a property wall on your left. Go down slightly and ignore a path coming from the right. The path gives way to an alley that leads to a larger street. Cross the street, take a few steps and immediately turn left onto Ruelle de la Ravine.
(8) At the crossroads, continue straight ahead along Rue des Prés. Turn right into Ruelle du Bray (still marked as Rue des Prés on the map), which becomes a grassy path. At a fork (not shown on the map), take the left-hand path and go through a forest gate. Wind your way between hedges and fences until you come out at the corner of a football stadium.
(9) Then turn right, leave a playground on your left and cross Sente de la Ravine on your left. At the T-junction, turn right onto Rue de la Source and, at the next crossroads, turn right onto Rue de la Libération. Pass the church and then the school (both on your left).
(8) Back at the junction with Ruelle de la Ravine, continue straight ahead (note the sundial dating from 1789 on the left). Cross Rue du Val on the left and go around an old mill on the left. Cross two branches of the Viosne (wash houses) and then the railway line at the level crossing. At the junction with the D92, continue straight ahead and climb the Raidillon (the well-deserved name of this dead-end alley). The alley gives way to a short path that leads to Place de l'Orme.
(10) Continue straight ahead towards the church and the castle (signposted). Go around the castle on the right, ignoring the narrow streets on the right. After a left turn off the main street, pass the entrance gate to the Château de Montgeroult. Continue straight ahead towards the statue of the Virgin Mary.
(11) At the foot of the statue, turn left towards the church. Go around the church on the right and, at the fork (calvary), follow the Route de Cormeilles on the left. Follow a property wall on your left and ignore all the side streets on the right. When a path continues straight ahead, stay on the tarmac and turn right. Enter the woods and look for the first turn on the left.
(12) Turn left at an acute angle onto Chemin de la Futaie (no entry). On leaving the woods, walk between fields and gardens and leave a shed on your left. Go downhill and, at a T-junction at the bottom of the hill, turn left onto Rue du Vieux Colombier. Cross Ruelle de la Fontaine on your right and return to Place de l'Orme.
(10) Continue straight ahead and slightly downhill on Rue des Roches. Ignore the courtyards and alleys on the right and descend, overlooking a meadow on your left. At the bottom, turn left and cross a stream (note the town hall on the right).
(13) Take the first left at number 17. At the fork that appears immediately, continue right and uphill on the paved road. You will soon come to a path in the woods and turn right to come out onto the open plateau. Walk between the fields, heading east-southeast, and ignore all the paths on the left. After a right-hand bend, rejoin the tarmac road.
(14) Go down the street and turn left with it. At the T-junction, follow the street to the left.
No signposts
After about 100 metres, at number 16, ignore the signpost and turn right into Ruelle de la Gare. You will immediately see the station on your right (S/E).
the sound of gunshots from hunters somewhere nearby!
Visorando Member
Easy 
Difficult 
Association / Club / Walk leader
