Start near the Etang de la Tretoire L'Emprunt.
(S/E) With the lake on your left, follow the path to the crossroads 250 metres further on.
(1) Turn left and follow the path down through the woods. Cross the D55 and continue to the village of Coton.
(2) In Coton, opposite the mill on the Petit Morin, take the tarmac road on the right towards La Forge. Immediately turn left onto the path that runs alongside the river and gradually enters the woods.
(3) At La Forge, go back up the tarmac road, go down it on the left and then on the right before the bridge. Follow the small path that runs alongside the fields and the Petit Morin river, as well as the old railway line. After about 1 km, go back up the old railway line and, 100 m further on, go back down the small path on the left. Follow it to the edge of the woods and walk alongside a field.
(4) At the end of the field, turn right and then take the second path on the right. Return to La Trétoire via this path through the woods, which crosses two other paths.
(1) Continue straight ahead to the car park (S/E).