The start is in the centre of the village, in front of the town hall. There are a few parking spaces, otherwise you can park in Rue Robert Guesnier.
Bus line 90.4, which runs from Pontoise to Bray-et-Lu, serves St-Gervais, but not all buses stop there (check in advance).
(S/E) To be in the direction of the route, the town hall should be on your right. Walk along Rue Robert Guesnier until you reach the edge of the village.
(1) Turn left towards Magny-en-Vexin until you reach Petit-Saint-Gervais.
(2) Turn left, then right, and continue to Etrez.
(3) Continue straight ahead until you reach the four-way intersection.
(4) Turn right onto Rue des 2 Communes and continue to the roundabout.
(5) Take thesecond exit, continue along the road and take the first path on the right. Continue to the undergrowth.
(6) Don't hesitate to enter the undergrowth, ducking your head. The path is not very visible at this point. The passage is slightly to the right. Continue to Croix Geneviève.
(7) Turn right, then left and continue to the main road.
(8) Turn left onto a tarmac road and pass under the D14. Turn left and descend to the hamlet of Archemont.
(9) In the centre of the hamlet, turn right onto Rue d'Amende. This becomes a track a little further on. Continue to the road, keeping as far to the right as possible.
(10) Turn left, then left again until you reach the hamlet of Magnitot.
(11) Turn right, then left to reach the Château de Magnitôt.
(12) Turn right, then keep right on the road until the next road.
(13) Turn left. Take the path on the right (before the cross) and continue to the crossroads.
(14) Turn left onto Rue de la Chapelle and continue to the hamlet of Ducourt. Continue along Rue de la Chapelle until you reach the path on the right.
(15) Take this path and keep right until you reach the crossroads you took on the way there.
(14) Turn left, then left again and continue to the crossroads you took on the way there. Go straight ahead and you will come to another fork.
(10) Continue left on the road and follow it until you reach the town hall of St-Gervais. Be careful when crossing the D14 and cross in two stages (S/E).