Park at the Chartreuse monastery.
(S/E) With your back to the monastery, follow the lane and turn left onto Rue de la Chartreuse.
(1) Continue right on this street until the crossroads.
(2) Turn left onto Rue de Montreuil. Go around the large roundabout on the right using the pedestrian crossings and continue straight ahead until you reach the crossroads.
(3) Turn right onto Rue du Moulin du Bacon and follow the Canche stream until you reach La Grenouillère, where you will cross the bridge.
(4) Turn right twice to follow Chemin du Robinson.
(5) Pass the confluence of the Canche and the Source.
(6) Leave the footbridge on your right and continue left until you reach the fork.
(7) Keep left on Chemin du Marais and rejoin La Grenouillère, which you passed earlier.
(4) Continue straight ahead for about 200 metres.
(8) Turn left onto Chemin des Remparts, then turn left towards the citadel.
(9) In front of the ramparts, turn left to go around them. Continue to the junction with Rue des Moulins.
(10) Follow it to the left to reach the lower town. At the bottom, follow Rue de l'Église to the right, turn left onto Grand Rue Ville Basse and you will come to a crossroads with Avenue de la Gare.
(11) Turn left, cross the bridge over the Canche and follow Rue Saint-Gengoult until you reach the crossroads you passed on the way there.
(3) Continue straight ahead to the roundabout, go around it on the left and continue along Rue de Montreuil.
(2) Turn right onto Rue de la Chartreuse and follow the same route as on the way there to return to the (S/E).