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Parking is available in the car park at the entrance to Sainte-Mesme, on the right-hand side of the D116 road when coming from Dourdan.
Yellow markings
(S/E) Take the road towards Dourdan (east), turn right at a right angle.
(1) Ignore the street coming from the left (this will be the return route), continue south and cross the Orge. When the road turns left at a right angle, continue straight ahead (south) on a small road and pass under the railway bridge. After a few dozen metres on a gentle slope, look for a path that branches off to the right.
(2) Take this path on the right, which runs flat or slightly uphill, alternating bends, alongside the Orge river. Pass a pond on your right. Further on, turn sharp right and you will reach a small road at a bridge over the Orge.
(3) Do not cross the bridge, but turn left onto the road that passes between a few properties (Chemin du Gué de l'Orge). After a left-hand bend, leave the road on your right and continue straight ahead on a path that passes through woods and meadows. Cross the Orge river and you will reach Saint-Martin-de-Bréthencourt.
(4) Take the street on the left, passing in front of the church. At a fork, stay on the main road, which turns right. Pass under the railway bridge and, immediately after, take the small road on the right (west) that leads to the cemetery. The road gives way to a path that passes by the source of the Orge (captured in masonry).
(5) At the crossroads, take the path that climbs to the right. Heading north-northwest, the path climbs steeply and comes out onto the plateau. Head north-northeast and go around the Ferme de la Brosse on the right.
(6) Take the small road to the north that comes from the farm. After about 200 metres, leave the road as it turns right and continue on a path between the fields, still heading north. Cross the D168 road and continue on the path opposite. At the fork that appears immediately, turn right towards the hamlet of Haut Bout. Cross the hamlet.
(7) At the exit of the hamlet, the path turns right (northeast). Descend to the edge of the Bois de Sainte-Mesme.
(8) Enter the woods and continue northeast. Cross the perpendicular paths, walk along a cultivated plot and pass close to a large building (fences). Leave the forest and descend to the hamlet of Denisy.
(9) Cross the road, walk past a few houses and climb up a steep path for a few dozen metres. You will come to a crossroads in the forest.
(10) Take a wide forest lane on the right. Make a wide left turn and continue northeast. After a right turn, at a crossroads with a small valley descending on the right, continue straight ahead. After a few dozen metres, at a fork, turn right (south) and leave the road to the rabbits on your left. You will reach another crossroads.
No signposts
(11) At the crossroads, leave thePR® trail on your right down a steep descent and continue straight ahead on the Route du Cordon. Follow this path, which heads generally south-west, until you reach a small forest road where you will find the PR® trail again.
Yellow signposts
(12) Take thePR® trail on the left. Make a loop to the right to go around the Pavillon forest house. Take a small road on the right. At the next intersection, turn right again. Cross a hamlet and join the D116 at the entrance to Sainte-Mesme.
(1) Turn right, then immediately left to return to the starting point (S/E).
Much of the trail is wooded, and the forest is magnificent. A very pleasant hike
Visorando member
Difficult 
Easy 
