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Parking is available at the car park at Le Marais, at the junction of the D27 and D131, near the Marais stables.
In addition to the signposting along almost the entire route, there are numbered markers for the Pays de Limours at various points, which are referred to in the description below.
Red and white signposts
(S/E) Follow the D27 towards Arpajon (east), staying on the left-hand side (beautiful row of plane trees). At the start of a right-hand bend and before a bridge, leave the road and turn left onto a path through the woods. Cross the bridge over the Ruisseau de Précedelle and continue to a crossroads.
(1) Turn left onto a grassy path and follow theGR®111north between the meadow and the field. The path curves to the right towards a pine forest. Continue until you reach a crossroads.
No signposts
(2) Leave theGR® and continue straight ahead (north-northeast). Pass a small camping area and reach the village of Berchevilliers. At the crossroads (bus shelter), turn left onto Rue du Bois Gaillard. Cross the bridge over the Prédecelle stream (ruined wash house on the right) and climb up to a crossroads at the Fontaine aux Cossons. Cross the D131 road (take care) and continue straight ahead along Rue des Morinières for a few metres.
Red and white markings
(3) At the fork, take theGR® trail on the right and head north-northwest between horse pastures. Just before the high-voltage power lines, turn right at a right angle. Head east, ignore a path on the right and reach a roundabout in Vaugrineuse.
(4) Take Rue du Chemin Tournant opposite. At the next crossroads (post box in the middle of the crossroads), turn left. At the next crossroads, turn right into Rue de la Gloriette.
Red and yellow markings
(5) From marker no. 49 to marker no. 48, the path runs alongside the Courson golf course, which is always on your left. Turn right onto the path heading south, with the Précedelle stream on your right. At the end of the path, turn left at a right angle and walk along a meadow on your right. At the end of this path, turn left again. The path is covered with white gravel and runs alongside a wood on your right.
Yellow signposting
(6) At marker no. 48-1, leave theGRP® trail on your right and continue straight ahead on the gravel path. This path bends to the right while remaining alongside the golf course.
No signposting
(7) At marker no. 48, leave the yellow markings on your left and continue south on a path (which is no longer gravel). You will reach a crossroads (marker no. 47-1). Opposite (due south), take the path between a wasteland (on your right) and old garden plots (on your left). Cross a road (marker no. 47-2) and continue south on a path through fields, ignoring a path branching off to the right.
Red and white markings
(8) Ignore a grassy path that branches off to the right, rejoin theGR®111and continue south. Cross a small road and continue downhill. Reach a street and then the Rond-Point de la Belle Etoile roundabout. Go around the roundabout and continue south on the road towards Breuillet. Follow the road, preferably on the left (pavement), and pass Borne n°47-7. Cross a first bridge over a stream, then a second bridge over the Rémarde; be careful, there is no pavement and the road is narrow. Just after the second bridge, note the commemorative stele on the right. When the road bends to the left, turn right onto a track towards the Folleville stud farm.
No signposts
(9) Leave theGR® trail on your left and continue straight ahead. The path is blocked to vehicles by small concrete blocks and then by two rows of tree trunks.
Yellow signposts
(10) At the junction with a road (marker no. 47-8), note a gate on the left opening onto a path leading to Baville Castle. Continue straight ahead (west-southwest) along a paved lane. Pass a farmhouse (Maison Neuve on the map) on your right, then a gate on your left leading to the castle, opposite a barrier opening onto a meadow.
(11) About 100 metres after the castle gate, look for the start of the path towards Ardenelle on the right. Be very careful as this path is not very well marked (if you turn left on the paved lane, you have gone too far; retrace your steps). The start of the path is marked first by a yellow arrow (almost illegible) on an old dead tree trunk, then by a yellow sign saying "Le Marais" on a young tree. Take the path on the right through the trees and you will soon come out into a meadow (on the right, you will see the roofs of the farm buildings you saw earlier). Take a barely visible path on the left in the meadow. Continue west along the edge of the woods. Turn right and descend to the hamlet of Ardenelle.
(12) Follow a small paved road and, when it bends to the left, take a path on the right that quickly becomes grassy. Walk alongside a house with a hedge, woodpiles and a few birch trees. Turn left and you will immediately come to a perpendicular path.
Yellow + red and yellow markings
Take this path on the right, heading north, across the fields. Enter the undergrowth, cross two river branches and come out onto the D27. Cross the road (be careful, busy road). Go up the path between two hedges (marker 47-13) and come out into the fields. Head north-northwest on the wide path between two plots of land and come out onto a small road. Turn left onto the road and continue for a few metres.
Orange markings
(13) At the "No Entry" sign, leave the road and turn right onto a path that runs alongside a wasteland. Then, going downhill, cross a small wood and stay on the edge of the wood on your left.
Red and white markings
(1) At the crossroads, follow the same route as on the way there: continue straight ahead, cross the small bridge, turn left to rejoin the road and follow it to the right until you reach the marsh (S/E).
Visorando member
Very difficult 
Association / Club / Walk leader
Difficult 
