The starting point is in front of the Château de Grouchy.
(S/E) First, facing the château, take the path on the left until you reach the wash house to join the northern exit of the park. Continue along the Font path which climbs up to the village of Immarmont, then continue along Rue Paul Doumer on the left. You will reach a four-way crossroads.
(1) Turn right at a 90° angle to climb to the top of the village. You will reach the crossroads of Chemin de la Croisette and Boulevard de la Libération.
(2) Turn left and follow the road alongside the fields. Cross the D22 roundabout with caution, then continue straight ahead. After the Pôle Médical, turn left onto Chemin de Gérocourt.
(3) Continue along this path and turn right onto Chemin de la Justice for 230 metres, then continue straight ahead on a dirt track. After 200 metres, you will find a path on the left that descends into a wood.
(4) Take this path and, when you come out of the woods, turn slightly left onto Rue Veuve Quatremain in the village of Boissy l'Aillerie.
(5) After 170 metres, turn left onto Rue Macaigne-Fortier, then after 100 metres, turn right down Rue de La République until you reach the level crossing.
(6) Cross the level crossing, then turn slightly left to continue on the D22 via Allée du Moulin. After the 90° bend, continue along Rue Pasteur, then along Route d'Ableiges for 1.25 km until you reach the village of Le Réal. On the left, take Rue de Panama, following the sign for "Marais du Missipipi", then immediately turn right and cross the level crossing on the left.
(7) Continue along the path on the left, which then turns right. At the next crossroads, turn right onto Chemin des Côtes de Bizières to return to the crossroads at the start of the route.
(1) Go down Rue Henri Lechaugette on the right to the western entrance of Grouchy Park.
(8) Enter the park, turn right, walk along the edge, then at the small car park, turn left into the large avenue until you reach the pond. Go around it on the right to return to the Château de Grouchy car park (S/E).
