Park near the Pont de la Citadelle in Montreuil-sur-Mer.
(S/E) Follow the path to the left, the Promenade des Remparts. Quickly reach the Tour de la Poterne.
(1) Take the path to the right that descends to the foot of the ramparts. At the junction with the Extra Muros signposting, continue straight ahead. Further on, at the junction with the Sentier du Bac, follow the path to the right as far as the road. Turn right to reach La Grenouillère.
(2) Cross the bridge over La Canche and turn immediately right. Drive alongside La Canche. Cross the railroad to reach Rue Saint-Gengoult.
(3) Cross it and continue along Allée du Franc Marais. Turn left to enter the woods and then reach the Pont Routier crossroads.
(4) Pass under the bridge, then turn left along the D901. At the edge of the wood, reach the crossroads of a track.
(5) Turn right and follow it, passing a hunting lodge on the right. Cross the footbridge and continue straight ahead through the bamboo. At the next two crossroads, follow the path to the right to reach La Canche.
(6) Turn right and follow the river. After several hundred metres, take the gravel path on the right.
Note: in dry weather, continue along La Canche to join the gravel path. Continue along the banks of the Canche to reach the Pont Routier.
(4) Continue along La Canche to Rue de Saint-Gengoult. Pass the canoe-kayak club, then turn left over the bridge and cross the railroad tracks to reach the station.
(7) Take the large staircase opposite the station. Cross the road, go straight ahead and take the path on the left behind the building. Follow the rampart at the bottom and admire the high wall of brick, sandstone, flint and white chalk. Enter Rue de la Tour-de-Justice.
(8) Immediately turn right up the hill to reach the Avenue des Garennes crossroads.
(9) Turn right. Pass the campervan area and the boules stadium. Cross Avenue du Général Leclerc at the crosswalk on your left. Go straight ahead and down the path between two houses. Reach the corner of the rampart.
Go around it, then take the Promenade des Remparts to get back to the original crossroads at the Tour de la Poterne.
(1) Turn right to reach the Pont de la Citadelle car park (S/E).