Country:
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Starting point and access: Cormeilles-en-Parisis station.
- Transilien - Line J, on the section between Paris-Saint-Lazare and Conflans/Mantes-la-Jolie/Gisors.
Take the Rue de Nancy exit and, at the end of the underpass, climb the stairs on the right.
No signposts
(S) Go straight ahead and cross the bus station in three steps. Then first turn right then left to take Rue du Sous-Lieutenant Édouard Vicario. At the traffic lights, takethe second right, Rue de Reims, and walk along a car park. At the end, follow Rue de Strasbourg to the left. At the next intersection, continue straight ahead (ignore the yellow arrow indicating a left turn).
(1) Take thefirst left onto Rue du Professeur Vaillant. Further on, turn right onto this street. At the end, first turn left then right to follow Rue Guy de Maupassant. Ignore two streets on the right and then one on the left and start down a cement driveway.
Red and white + yellow markings
(2) When the cement path veers to the right, turn right onto Sente des Verjus. Follow this gravel path, go through a gate and continue straight ahead. Return to the tarmac road and walk past the small buildings on the right-hand side. At the end of the tarmac road, go through a gate and continue along a gravel path, still on Sente des Verjus. At the next intersection, continue straight ahead and go down the Rampe du Beau Site (beautiful view of the Seine). Finish the descent by taking a small staircase that leads to a street.
(3) Cross at the pedestrian crossing and continue opposite on Rue du Vieux Cimetière. Climb a steep hill. At the top, turn left onto Rue Aristide Briand. Continue straight ahead (views of the Seine on the left) and pass a school on the right.
(4) After No. 22, go down a flight of steps on the left and take Sente du Haut de la Côte du Village. Go down between walls and fences. You will come to a road; follow it to the left, still going downhill. At the crossroads immediately ahead, turn right and go uphill (views of the Seine). When the street turns right, turn left onto Sente de Grande Côte. Go down this gravel path interspersed with wooden steps. You will come to a street; follow it as it continues. Ignore a path on the left (yellow arrow) and you will come to a T-junction.
Red and white markings
(5) Then turn left. At the stop sign, take thesecond right, Rue Gambetta, and go up. After about 40 metres, turn left onto Sente des Côtes d'Herblay. Go up, alternating between cement path and steps. Continue on a gravel path, ignore a tarmac road on the right, continue straight ahead and rejoin the tarmac road further on.
Red and white + yellow markings
Cross Sente du Bas des Clos on the right-hand side and continue straight ahead along the street. When the street turns right, continue straight ahead along a path between two walls. After about 400 metres, at the corner of the wall on the right, turn right and walk past the side of Herblay Church. You will come out onto Rue Jean XIII. Follow this street to the left until you reach the church square.
(6) With your back to the church entrance, locate Chemin des Écoliers on the right-hand side of the esplanade and go down this path, which is interspersed with steps. At a three-way junction, turn right and descend the winding path. You will come out onto a street. Follow it to the left and continue straight ahead until you reach the end. Then cross the Quai du Génie at the pedestrian crossing (ferry station).
(7) Then turn right and take a pedestrian path between the Seine on the left and the quay on the right. Continue straight ahead as close to the river as possible.
Red and white markings
At the entrance to a residential building, continue straight ahead along the Seine (ignore the yellow markings on the right).
No markings
(8) When you reach a metal barrier, continue along the Seine (ignore theGR® trail on the right). Follow a path between the river on the left and a cycle path on the right.
Red and white markings
(9) Go through a metal barrier, rejoin theGR®2and continue straight ahead along the Seine. Go under a high-voltage power line and enter Conflans-Sainte-Honorine. Atthe first stop sign, go straight ahead onto Quai de Gaillon (narrow shoulder). Atthe second stop sign, continue straight ahead along the Seine on a well-marked pavement.
(10) Pass Port Nicolas and follow a footpath along the Seine, parallel to Quai des Martyrs de la Résistance. Note the Conflans church on your right, then the Montjoie Tower.
(11) Go down a ramp on the left and follow the Promenade François Mitterand (concrete quay closest to the river). Continue along a car park. Pass the "Je sers" barge chapel. Keep left to pass under the Passerelle Saint-Nicolas (note the statue of the bishop on the upstream pier) and a road bridge. Continue straight ahead on the concrete quay.
No signposts
(12) At the foot of the railway bridge, climb a flight of steps on the right. Cross the D48 at the pedestrian crossing and continue straight ahead, following the railway line on your left. This will take you to Conflans-Fin-d'Oise station (E).
To return home:
- RER - Line A, towards La Défense and Paris or Cergy (immediate access).
- Transilien - Line L, towards Paris-Saint-Lazare or Cergy (immediate access).
- Transilien - Line J, towards Paris-Saint-Lazare or Mantes-la-Jolie or Gisors (go to the end of the RER platform and climb the stairs leading to the perpendicular platform for line J).
Visorando member
Easy 
Association / Club / Walk leader
