Park in the church car park - 4 Rue de l'Église, 78250 Oinville-sur-Montcient.
(S/E) When leaving the car park, turn right and go down Rue de l'Église. Cross Rue des Thurets on the left and continue along Rue de la Mathurine.
(1) At the next intersection, turn right. The tarmac quickly gives way to a dirt track. Pass under the high-voltage power lines and join a small road (reservoir).
(2) Take thefirst dirt track on the right between the fields. Further on, walk along the Bois de Dalibray on your left. At the T-junction, turn left and you will soon come to a fork.
(3) Take the path on the right. Cross straight ahead (south-east) through the Bois des Juliens, ignoring any tracks on either side. You will rejoin the tarmac road at a riding centre.
(4) Turn right at an acute angle onto a path between horse pastures. Then cross a wooded area and continue to a clearing.
(5) At the T-junction, first turn right then left to follow the GR®2 (red and white markings). Enter a wood and continue to a four-way junction.
(6) Turn right onto the GR®2. Cross Chemin de la Gueule Rouge and continue straight ahead until you reach a tarmac road.
(7) Then turn right. After about 200 m, turn left (straight ahead is private property). At the T-junction, first turn right then left (only follow the GR® for a few metres). Descend and reach a crossroads under high-voltage power lines.
(8) Then turn left. After the power lines, ignore a turn-off on the left and continue west into a wood. At a crossroads (elevation 153), turn right. You will come out onto a road; follow it to the right for about 350 metres.
(9) Turn left onto the path, then turn right onto the path on the right.
(10) At the crossroads, turn left and pass in front of the Moulin Brûlé. You will come out onto the D913; follow it to the right. After about 300 m, take Rue de Bachambre on the right until you reach a crossroads. Continue along Rue de l'École to quickly reach the church car park (S/E).