Parking is available in the small car park opposite the church in Saint-Cyr-sous-Dourdan. Access via the A10 motorway, exit "Dourdan", then take the D27 towards Le Val-Saint-Germain.
(S/E) Take the street that passes in front of the church, go around it on the right and cross the village, heading east.
(1) After about 400 metres, turn right and cross a river on a footbridge with a wash house on your right. Follow the red and white markings ofthe GR®111and continue along a small paved road at a place called Pont-de-Rué.
(2) You will come out onto the D27 and follow it to the left for a good hundred metres. Then take a path on the right at the corner of a house. The path is clear at first, then enters the woods.
(3) Shortly after leaving the woods, you will come to a poorly marked crossroads with a footbridge without railings on the right and a large field on the left. Turn left (south-east) and climb gently to the edge of a small wood (on your right) and the large field (on your left). Enter the woods.
(4) At elevation 148, do not leave the woods as the path in front of you suggests, but turn right. Stay on the edge of the woods with a meadow on your left behind a hedge. Then cross a meadow with woods below on your right. Descend to the Vaubesnard farm.
(5) Continue south-west on a small road. At elevation 158, the road turns sharply to the right. Pass a small industrial estate.
(6) Cross the D383 (take care) and continue to a wood. At the entrance to the wood, make a left-right zigzag (leaving theGR®11, which goes towards Dourdan, on your left). Continue west through the wood for about 300 metres.
(7) At a crossroads, take theGR® de Pays on the right (red and yellow markings). Follow a path through fields that heads north-west then north, going downhill. You will arrive at the hamlet of Rouillon (rural lodge).
(8) Turn right onto the road and you will immediately reach the village of Bouc Étourdi (you will be in a different department).
(9) At the T-junction, turn right onto the road. On leaving the village, take a path on the left that climbs gently between the fields. Enter the woods, pass a sort of pass and come out between the fields.
(10) At elevation 123, take the first road on the right, at a right angle and heading east. Drive through the fields until you reach the hamlet of Foisnard.
(11) At a farm shed (on your left), do not follow the road to the right but continue roughly opposite where you came from and take a small path that runs alongside gardens on your right. Join a small road and follow it to the left.
(12) Cross the D27 (take care) and continue straight ahead on a path. Cross two branches of a river and reach the village of Bandeville.
(13) Turn right into the street. Walk along a sports field on your right. Cross a crossroads and you will see the church of Saint-Cyr opposite (S/E).