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District:
(S) Start: Pontoise SNCF station. Take the Gare routière / Canrobert exit, then head towards Avenue Maréchal Canrobert. Walk down the avenue, then take thefirst left after the SNCF operations centre at the Pont de l’Oise. Follow the Viosne river to Avenue du Général Gabriel Delarue (D14). Cross at the traffic lights.
GRP® (red and yellow markings)
(1) Turn right onto Chemin de la Pelouse, which runs alongside the Oise, go under the A15 bridge, then cross the Parc des Larris, which is a area of sheep pastures.
PR® (yellow markings)
(2) On leaving the park, leave the GRP®. Follow the PR® which passes under a road bridge, then under the RER tracks to emerge onto Boulevard des Maraîchers. Walk alongside the farm until the end of the boulevard, where it becomes a tarmac track, then turn right towards the Bois de la Balastière.
(3) The PR® soon turns left. Follow it closely until you reach the edge of the woods. Walk up the cul-de-sac, Allée des Plantes, then turn left onto Chemin Neuf towards the Oise, and finally right under the road bridge.
(4) Continue straight on, along Avenue Jean Bart, to reach Port Cergy. Pass under a large archway, then cross the bridge on the left.
No signposting in the Île de Loisirs
(5) At the end of the bridge, continue up the steps, then opposite, PR® blocked. Atthe second junction , turn right onto the wide path leading to the Axe Majeur footbridge.
(6) Take the footbridge, then follow the Axe Majeur up to the GRP® located on the former Voie du Tacot.
GRP® (red and yellow markings)
(7) Follow the path to the left until you reach Rue de l’Ancienne Mairie. Cross at the pedestrian crossing, turn left, then right onto Rue Neuve. A little further on, turn right onto the path between the houses, then left onto Impasse Jules Bourgain. At the crossroads, take Rue de l’Église on the right, then thefirst path on the left. As you leave the woods, take the path on the left.
(8) After the covered walkway known as the Cimetière des Anglais, continue straight on to the car park by the pétanque court. Just after this, be careful as the signposting is misleading: turn right, then immediately left onto the tarmac road, heading towards the Promenade des Loctaines. Further on, there is a viewpoint on the left (picnic area available).
(9) At the end of the promenade, take the Chemin du Dessus des Villettes opposite until you reach the T-junction, then turn right onto Rue des Valanchards. Cross at the pedestrian crossing, then turn left towards the car park (underpass). Continue along the GRP®, do not head towards the sports ground. At the fork, turn right, then right again. Go down the stairs via several hairpin bends, then cross the footbridge.
No signposting
(10) On the way up, turn left, leaving the GRP® on your right, then go straight on to the cul-de-sac (housing estate). At the junction, turn left. Cross Rue de la Vallée and take the steps opposite. At the very last step, turn left onto a wide path. Pass the concrete blocks, walk alongside the houses on the edge of the forest, then cross a clearing. Continue through the forest to the Chemin (tarmac) des Marlènes. Follow it up, then continue along the road opposite. Cross at the pedestrian crossing. Take the wide path opposite, running alongside the houses. Pass two paths on the left. Atthe third, go straight down to a clearing which leads onto the old (tarmac) Voie du Tacot.
PR® (yellow markings)
(11) Turn right, then go straight on. Cross Boulevard d'Ecancourt. Cut across thefirst street, then thesecond.
Unmarked
(12) Take the path opposite, continuing across the fields. At Impasse Paul-Émile Victor, turn immediately right onto a path, then continue straight on to Maurecourt Cemetery. Go round it on the left before coming out onto a street which you take to the right, following the cemetery wall. At the crossroads, cross the street.
GRP® (red and yellow markings)
(13) Take the wide dirt track that runs between the houses. Continue straight on until you reach the Oise. Turn right until you reach a street (Quai Boubou Dado). Follow the quay to Andrésy, pass under the Eiffel railway bridge and reach the road bridge.
GR® (red and white markings)
(14) Turn right onto the pedestrian ramp leading to the bridge, cross the Oise and then go down the pedestrian ramp to the other bank. Pass under the bridge, then cross towards the confluence of the Oise and the Seine.
(15) Walk past the monument. Follow the quay that passes under the RER bridge, then the N184 bridge followed by a footbridge, continuing along the Promenade François Mitterrand.
(16) Continue straight ahead, noting the chapel boat "Je sers", and reach Place Fouillère, a wooden esplanade and city discovery trail. Continue to Port Saint-Nicolas.
No signposting
(17) At the two low concrete walls framing the flowerbeds, take the small staircase (restaurant opposite). Cross over (pedestrian crossing), turn left for a few metres, then right onto Ruelle de la Chaussée. Go up the stairs, then turn left onto Rue de la Savaterie. At the fork, turn right, then right again towards the square.
(18) Walk along the right-hand side of Saint-Maclou Church to Place Jules Gévelot. Go round it, then enter the courtyard of the Musée de la Batellerie at the Château du Prieuré.
(19) Go under the building to enter the Parc du Prieuré (open 7 days a week from 7.30 am to 8.30 pm or 10 pm depending on the season). Turn left, then right in front of the greenhouse, then left. Go down the grand staircase to leave the park. Turn right onto Rue Pasteur. After the bend, turn left into Passage des Fondées, then immediately left again. Go up the stairs, continue straight ahead to Avenue Jean-Jaurès. Turn right to reach Conflans station (E) (line J – direct connection to Pontoise station).
Visorando member
Moderate 
Easy 
Association / Club / Walk leader
