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Departure from Les Mureaux station (SNCF J line).
(S) Exit on the north side and walk along Avenue Paul Raoult on the left-hand pavement. When you reach a complex interchange-type crossroads, stay on the pavement that turns left. At the first traffic lights, cross and continue straight ahead on Avenue Félix Faure. At the four-way intersection, continue straight ahead on Rue Albert Glandaz and you will arrive at the banks of the Seine.
(1) Continue along Rue Albert Glandaz on the right and walk along the left bank of the Seine, first on the street, which ends and becomes a pedestrian/cycle path. Walk along the ESA-Ariane site, then the path becomes a trail. Continue to the marina.
(2) Go around the basin on the right and reach the banks of the Seine. Walk along the Étang de la Grosse Pierre, continue along the Seine and arrive near the Étang du Gallardon. Follow the marked GRP® trail, which remains within sight of the pond. You will arrive at an opening in a fence.
(3) Reach a street and turn left to return to the banks of the Seine. Follow the banks of the Seine on the right until you reach the foot of the bridge. Climb the stairs, turn left to cross the Seine on the bridge. Immediately descend the bridge on the ramp on the left and reach the right bank of the Seine.
(4) Turn right after 100 metres to enter Parc Senet, where there are numerous benches for picnics. After your picnic, return to the banks of the Seine.
(4) Continue down the Seine for 200 metres to the right until you reach a small roundabout. Take Rue Cadot on the right, then the alleyway that passes to the left of the theatre and ends with some steps. At the top, turn left and visit Saint-Martin Church. Pass underneath and continue under the railway line, then take the first street on the right. You will arrive at Place des Marronniers. Turn slightly to the left, then cross the street to find a staircase.
(5) Go up the stairs, then continue straight ahead on a narrow path. At the end of the path, continue almost straight ahead on Rue Octave Mirbeau. Continue to the forest, then follow a wire fence on the left, at the edge of the forest. Pass the first path on the right and follow the fence until you reach a bend to the left at a low point.
(6) Take the well-marked path that climbs to the right. Continue on the best-marked path that winds its way up the hill. When you reach a T-junction on a sort of military ridge, take the path on the right and then stay on the edge of the plateau. The path then turns left and joins a complex junction of several paths.
(7) First, head right towards the south (opposite two trees marked with an orange H). After 50 metres, at a fork, go left, then again, 50 metres further on, take the path that branches off to the left at a right angle. Stay on the main path, which is lined with numerous signs clearly indicating: Danger, No Entry, Risk of Collapse, Underground Quarries. Indeed, you can see numerous chasms on either side of the path. The path remains more or less on the edge of the plateau before turning left and reaching the D22.
(8) Cross it very carefully: there is no pedestrian crossing! On the other side, there are two memorials: one in memory of the cyclist Pascal Jules, the other commemorating the first hill climb race (27/11/1898). Enter the forest to take the Chemin du Cordon (signposted). At the crossroads, continue straight ahead on Chemin de la Grande Rue until the end of the descent after the EHPAD.
(9) At the left-hand bend, take the Sente des Cures on the right for 40 metres, then immediately left onto a path that runs alongside fields. Continue straight down to the D55.
(10) Cross it very carefully and turn left to the orientation table, which gives you a good understanding of the wide panorama that unfolds before your eyes.
(11) Return along the D55.
(10) Descend to the left onto Sentier des Barils, which becomes Rue des Barils further down. At the end, turn left to walk along the railway cutting. Cross the bridge over the railway tracks and turn right along the cemetery wall. Enter the cemetery to see the Carolingian cross and the (copy of the) Merovingian stone.
(12) At the cemetery exit, turn left to continue along the railway cutting. The path ends with a flight of steps. When you reach the street, turn left. Go down Impasse des Barils, continue up the steps, then turn left to Saint-Germain Church.
(13) Go around the church on the left and go down the alley to the Seine. Take the bank on the left and go up the Oise a little.
(14) Go under a bridge, then climb up the ramp on the left and cross the Oise. At the end of the bridge, go down the ramp on the left. At the bottom, cross the street, turn right, then left into the small car park. At the end, take the stairs leading to the station (E).
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