Departure from the Ecouen castle car park.
(S) Go down the path to the fort, then walk along it following theGR® markings (go around the fort to the east and then south).
(1) At the Chauffour crossroads, turn right and continue to follow the GR® trail. Leave theGR® when it enters the town on the left and continue straight ahead, following thePR® (yellow markings).
Turn left and enter the town towards the station.
(2) Turn right onto Rue de la Gare and continue along Avenue Foch.
(3) At the three-way junction, take the path on the left. At the next crossroads (elevation 88), turn right towards the gas installation. Before reaching it, turn left and follow the path that leads to the Bizouard woods, which you will pass on your right. The trail leads to a path that you take on the right.
(4) At the entrance to Mesnil-Aubry, join theGR® de pays de la plaine de France, which is on the right at the entrance to the village. At a fork opposite an orchard, turn left towards Ecouen. Follow the yellow markings through the town to the château. Cross the park, taking the stairs that lead to the castle entrance, then head to the car park (E).
