The walk starts at the car park in front of the castle entrance, on Rue René de Girardin, in Ermenonville.
(S/E) With your back to the car park, head right onto Rue Prince Radziwill, going uphill, then take the first street on the left, Rue Jean-Jacques Rousseau. At the next junction, keep left, pass the town hall and continue left, going uphill along the street to the pedestrian crossing. Cross over, take Rue Radziwill, walk past the school and arrive at the entrance to the cemetery.
(1) Turn left, walk past the church and the priory on your right. Cross the road and go down the street opposite (Rue de la Cavée) without going all the way to the end.
(2) Just before the end of this street, turn right onto a cobbled street, Chemin du Moulin, and after 250 m, you will reach a path on the right.
(3) Follow this path, keeping to the left along the edge of the woods and a stream (the Suret). Ignore a turn-off to the left (the three-way junction) and continue for about a hundred metres.
(4) Turn left (Chemin du Tourne-Bruyère); after 300 m, at the next T-junction, turn right and, at the end of this path, at another T-junction, continue left along the straight path until you reach a track at the Carrefour de Montagny.
(5) Take thethird path on the right (Chemin de Perthe), passing the remarkable tree known as the Ancêtre de Perthe, which is 37 metres tall and 250 years old: certainly the oldest oak in the forest. You will soon reach a cross-path at the 120-metre mark.
(6) Turn left at this T-junction and ignore the next two crossroads.
(7) At the third junction, take the path on the right, heading north-east, and continue to the next junction.
(8) Head left until you reach another junction.
(9) Wander a little through the rocks and sandy paths and, after completing a circular route, return to the previous junction.
(8) Turn left and, 200 m further on, turn left again onto a straight path. After 400 m, pass thefirst junction, a path on the left after 180 m, a path on the right after 100 m, and continue for another 200 m to a crossroads (located approximately 350 m before the D100).
(10) Turn left and rejoin the road. Leave it and turn left again, heading due west. Ignore the three paths on the right. The path curves to the left and reaches a junction (elevation 85).
(11) Turn right (Chemin du Roi) and further on, at the T-junction, turn left onto the straight Chemin de Baron. Pass a crossroads and arrive at a star-shaped junction with multiple directions.
(12) Head due south along the second path on the left (Chemin du Chêne Penché) and reach the Carrefour de la Croix Marchand.
(13) Turn left, south-east, onto the second path (Route de Montmagny). Ignore a turn-off to the right (Route des Bons Amis) and continue straight on until the next star-shaped junction (Carrefour de la Basse Corde).
(14) Head due south, taking the second path on the right, pass the Pierre Sorcière on your left, then cross a track (Route du Regard) and reach the three-way junction.
(15) Turn right onto Route de Perthe. Much further on, at the T-junction, follow Chemin du Moulin to the left and cross the stream to reach a fork you passed on the way out.
(3) Carry straight on in the opposite direction to the outward journey and reach another fork, which you also passed on the way out.
(2) Turn right (Rue de la Cavée) then immediately left (Rue Souville) and carry straight on until you reach the car park on Rue René de Girardin (S/E).
