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Start 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 platform 2 (if arriving on platform 1, take the footbridge).
Yellow markings
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 as in Julius Caesar).
(S/E) On leaving the station, turn right, pass a hiking map on the left-hand side and walk alongside the car park. At the junction (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 in succession (old mill), then turn right with the road.
(2) At the fork in the road, turn right onto Rue Raspail and head uphill. At the wayside cross, turn right with the road, which soon gives way to a path leading into a wood. On emerging from the wood, ignore the path branching 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-municipal cemetery, then walk along a hedge on your left, with the cemetery beyond. You’ll come out onto a road; follow it to the right uphill for about a hundred metres.
(4) Then turn right onto the Chaussée Jules César (signposted), which begins as a tarmac track. When the track bends to the left, carry on straight ahead, passing concrete bollards and then a forest gate, and follow a shaded path. Walk through the woodland, keeping a west-north-westerly direction.
(5) At a junction with a path coming from the right (the path to the left at a 90° angle shown on the map does not exist), carry on, veering slightly to the left. Go downhill and take a hairpin bend to the left. As you emerge from the woods, veer to the right and walk along a fenced-off meadow on your right. The path becomes narrow and overgrown. After a more open stretch, you’ll come out onto a small road.
(6) Cross the road and follow a wide gravel path opposite (still the Chaussée Jules César). Pass the Croix Justice (a metal cross) and head downhill. Cross a small road and head back up the Chaussée Jules César opposite, which here is a grassy path. At the crossroads (the stone Croix de Labathe on the left), carry on straight ahead and head downhill through the woodland.
(7) At the junction at the bottom of the descent, turn sharply right and follow a fence on your left, first through the woodland and then along the edge of the woods. When you reach a gate, veer to the right and follow a property wall on your left. Walk down a slight slope and ignore a path coming from the right. The path gives way to a narrow lane which opens out onto a main road. Cross the road, take a few steps and immediately turn left into Ruelle de la Ravine.
(8) At the junction, carry straight on 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 in the road (not shown on the map), take the path on the left and pass through a forest gate. Wind your way between hedges and fences until you emerge at the corner of a football ground.
(9) Then turn right, passing a playground on your left and crossing the Sente de la Ravine on the left. At the T-junction, turn right onto Rue de la Source and, at the next crossroads, turn right onto Rue de la Libération. Walk past the church and then the school (both on the left-hand side).
(8) Back at the junction with the Ruelle de la Ravine, carry on straight ahead (note the sundial dating from 1789 on the left). Cross the Rue du Val on the left and go round an old mill on the left-hand side. Cross two branches of the Viosne (wash houses) in succession, then the railway line at the level crossing. At the junction with the D92, carry on straight ahead and climb the Raidillon (this is the well-deserved name of this dead-end lane). The lane gives way to a short path which leads out onto Place de l’Orme.
(10) Carry on straight ahead towards the church and the castle (signposted). Go round the castle on the right, ignoring the lanes on the right. After a left-hand bend in the main road, pass the entrance gate to the Château de Montgeroult. Carry on straight ahead towards the statue of the Virgin Mary.
(11) At the foot of the statue, turn left towards the church. Go round the church on the right and, at the Fork in the road (calvary), follow the Route de Cormeilles to the left. Walk alongside a property wall on your left and ignore all the alleys on the right. When a path branches off ahead, stay on the tarmac and turn right. Enter the woods and look out for the first turn-off on the left.
(12) Turn sharply left onto the Chemin de la Futaie (no entry). As you leave the woods, walk between fields and gardens, passing a shed on your left. Head downhill and, at a T-junction at the bottom of the slope, turn left onto the Rue du Vieux Colombier. Pass the Ruelle de la Fontaine on your right and return to the Place de l’Orme.
(10) Continue straight on, slightly downhill, along Rue des Roches. Ignore the courtyards and alleys on the right and walk downhill, 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, opposite No. 17. At the Fork in the road immediately ahead, continue to the right and uphill on the tarmac. You will soon come to a path through the woodland; turn right to emerge onto the open plateau. Walk between the fields, heading east-southeast, and ignore all the paths branching off to the left. After a right-hand bend, you’ll rejoin the tarmac road.
(14) Walk down the street and turn left as it curves. At the T-junction, follow the street to the left.
No signposting
After about a hundred metres, near No. 16, leave the signposted route and turn right onto Ruelle de la Gare. You’ll immediately see the station on your right (S/E).
the sound of gunshots from hunters somewhere nearby!
Visorando Member
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Difficult 
Association / Club / Walk leader
