Starting point: car park no. 4, Route de Paris, Ermenonville.
(S/E) When leaving the car park, turn left and keep left at the fork that appears shortly afterwards to follow Chemin de la Mare des Eaux.
(1) At the crossroads, turn right onto Vieux Chemin de Meaux.
(2) Cross Route d'Ermenonville, then Route de l'Abbaye and join 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 the Vieille Route and cross the Carrefour du Bois d'Hiver.
(5) Turn left, leaving the château and the Ancienne Abbaye Royale de Chaalis on your right, and at the four-way crossroads, 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, go straight ahead, staying on the same path.
(9) At the Croix Marchand crossroads, take Route de Montagny to the right of the cross, pass Carrefour des Bons Amis and reach 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 (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 three-way junction on the 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 you will reach a crossroads.
(16) Turn right onto Rue René Girardin, pass Château d'Ermenonville and cross the Launette.
(17) Turn left after No. 23, cross Route de Paris carefully in two stages and continue straight ahead to reach the car park (S/E).