Starting point: car park no. 4 on Route de Paris in Ermenonville. There is also a car park on Rue René Girardin opposite the castle entrance. If you start the walk from this car park, go to point (17) then the starting point of the other car park and point (1).
(S/E) When leaving the car park, turn left and keep left at the fork that appears quickly to follow the Chemin de la Mare des Eaux.
(1) At the crossroads, turn right onto the Vieux Chemin de Meaux.
(2) Cross the Route d'Ermenonville, then the Route de l'Abbaye and join the Route de l'Éventail.
(3) Turn right onto Route de l'Eventail, then right again a little further on onto Route de la Croix Neuve.
(4) Turn right onto Vieille Route and cross Carrefour du Bois d'Hiver.
(5) Turn left, leaving the castle and the former Royal Abbey of Chaalis on your right, and at the four-way intersection, turn right to reach the Fontaine Sainte-Geneviève.
(6) Continue to the crossroads and turn left. Continue straight ahead towards Montlognon.
(7) Turn sharply right, then veer right to go along the cemetery and continue straight on Chemin du Chêne Penché.
(8) At the star-shaped crossroads, continue straight ahead, staying on the same road.
(9) At the Croix Marchand crossroads, take Route de Montagny to the right of the cross, pass Carrefour des Bons Amis and continue to Carrefour de la Basse Corde.
(10) Turn onto thesecond path on the right and you will soon reach the Pierre Sorcière.
(11) Pass in front of it and a little further on, a path climbs up this vast rock overlooking the Mer de Sable (a beautiful viewpoint and a great place for a picnic), then return to the path.
(12) At the junction with the wide track, turn left onto Route du Regard.
(13) At Poteau de Perthe, turn right at the second turn, cross Route Tournante and reach a T-junction at the edge of the forest.
(14) Turn right onto Vieux Chemin d'Ermenonville, ignore Chemin de la Patte d'Oie on your right and follow Ru du Suret.
(15) Turn left onto Rue du Moulin and, at the T-junction, turn right and then immediately left to follow Rue Souville. Pass the Jardins de Médicis on your right and continue to a junction.
(16) Turn right onto Rue René Girardin, pass Château d'Ermenonville and cross the Launette.
(17) Turn left after No. 23, carefully cross Route de Paris in two stages and continue straight ahead to reach the car park (S/E).