Departure from the car park of the L'Isle-Adam-Parmain swimming pool, 1 Avenue Paul Thoureau, in L'Isle-Adam. For access by train, see practical information.
(S/E) Take the south exit of the car park onto Avenue du Général De Gaulle. Turn right onto Chemin Pierre Terver, then follow Chemin de Halage on the left, which passes behind the statue "Esquisse de la première danse". After the footbridge near L'Isle-Adam beach, pass under the Rue de Conti bridge.
(1) Take theGR®1trail marked in red and white, going up the ramp on the left. Cross at the pedestrian crossing, then turn left onto Rue de Conti. Continue straight ahead until you reach the level crossing.
(2) After the railway line, cross the D4 at the pedestrian crossing. Go up Rue Guichard then Rue du Maréchal Foch on the right. Leave the path on the left.
(3) Leave Rue du Maréchal Foch for Chemin de la Justice, which climbs to the left of a crucifix. After the climb, ignore Chemin de Pontoise on the left, then cross Chemin de Verville à Jouy. Leave the paths coming from the right and in the woods, turn left twice.
(4) At the fork, keep to the right. At the end of the descent, turn left and ignore the path on the right. After the Nesles-la-Vallée campsite, take Chemin des Bourbottes on the right.
(5) Leave Chemin des Belles Vues and turn right onto Route de Parmain. Ignore Sentier du Pré à l'Âne on the left. Go straight ahead at the three-way junction. Continue along Boulevard de Verdun and walk along the right-hand side of the square in front of the town hall.
(6) Pass to the left of the church, ignore the car park and turn left onto Rue de la Falaise. Cross the Sausseron and follow Allée Saint-Denis to the left. At the fork, go left. Cross a path and then Rue de Pontoise.
(7) After the car park, continue straight ahead. Pass two paths on the right, cross Sentier du Moulin and then Sentier du Petit Pont à Savarin.
(8) Take the protected passage, then the path closed to motor vehicles. Cross two passages leading to private properties. Then turn right onto Rue Léon Bernard.
(9) Cross Rue Georges Duhamel. In the woods, go up to the left. Once in the fields, ignore two paths on the right and then one on the left.
(10) At the crossroads, go straight ahead to the right of the crucifix. Stay on the road at the next junction and after a path on the right. Continue straight ahead at another crossroads.
(11) Leave the road by taking the first path on the left. Walk along the woods and then follow the path marked in red and white on the left. In the woods, cross a small path.
(12) At the end of the path, take the road on the right, Chemin des Vallées au Veau. Pass a one-way road on the right and Rue du Montier on the left. Walk past the Atelier de Daubigny.
(13) Continue along Rue Daubigny on the left, leaving theGR®1, which follows Rue de Léry, on your right. Ignore all the passages on the right.
(14) Take the stairs up to the Church of Notre-Dame. Go around the church on the left. Go up Rue Ferdinand Mesny on the left. At the three-way junction, take the middle path. In the fields, at the crossroads, turn right.
(15) Walk along the left-hand side of the cemetery. Continue along the road. Return to the church and then take the steps you took earlier.
(14) At the bottom of the steps, turn left then go down Rue de Paris on the right. Cross Rue du Général De Gaulle at the pedestrian crossing. Go over the railway line and continue straight ahead at the crossroads. Take the bridge over the Oise and take the first passage on the left to reach the Chemin de Halage.
(16) Stay on this path along the Oise (on your left) until you reach the railway bridge.
(17) Go under the bridge and climb the stairs on the right. Cross the Oise via the road bridge. On the other side, go down the stairs on the right. Return to the towpath and follow the Oise again, now on your right. Take a footbridge over a tributary and rejoin the tarmac road a little further on.
(18) Continue along Avenue de L'Oise, still following the river. At the stop sign, continue straight ahead on Quai des Saules.
(19) Go under the railway line and take the footpath on the right. Continue to the level crossing.
(2) At this point, there are two options depending on your mode of transport:
- If you came by train: go to the L'Isle-Adam-Parmain station opposite.
- If you came by car: cross the railway line and follow Rue de Conti. Before taking the third bridge over the Oise, cross the street at the pedestrian crossing. Turn left onto Rue de la Capitainerie.
(20) Pass the entrance to L'Isle-Adam beach. Follow Avenue du Général de Gaulle to the swimming pool car park (S/E).