Country:
District:
Parking available at Le Marais, at the junction of the D27 and D131, near the Marais stables.
In addition to the markings along almost the entire route, there are numbered markers for the Pays de Limours, which are referred to in the following description.
Red and white markings
(S/E) Follow the D27 towards Arpajon (east), staying on the left-hand shoulder (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 you will reach a crossroads.
(1) Turn left onto a grassy path and follow theGR®®111north between meadows and fields. The path curves to the right towards a pine forest. You will reach a crossroads.
(2) Turn right onto a path that enters the woods. The path climbs slightly and widens into a track. Pass a forest barrier and then marker no. 47-14. Continue straight ahead (east) and walk along the garden fencing on your left. Pass another forest barrier and then marker no. 47-15. Continue in the same direction and follow the small road coming from the left.
No markings (the purple line on the IGN map seems inappropriate)
(3) At the fork, leave theGR®® and turn left onto Rue de la Bourguignette (towards the "Bibliothèque").
Red and yellow markings
(4) At the next crossroads (old well on the right-hand side), turn left at an acute angle onto Chemin de la Gloriette and follow theGRP®® du Hurepoix northwards between the fields. Enter the Bois de Bourguignette and descend. At the "Private Property" sign, turn left onto the path. At the bottom of the descent, go through a chicane and then a stream.
Yellow markings
(5) At the T-junction (marker no. 48-1), turn right onto a gravel path. Until the next crossing point, continue along the Courson golf course on your left: at marker no. 48, turn left at a right angle; further on, pass a forest barrier (marker no. 47) and veer left.
(6) At the crossroads (marker no. 46), continue straight on towards Courson (ignore a yellow marker on the left-hand path; two differentPR®® trails cross here). Cross the Bois des Bouleaux forest heading north-east, ignoring two trailheads on the left. Pass a forest barrier (marker no. 45) and continue straight ahead on a road (ignore a yellow arrow seen previously inviting you to turn left).
(7) When the road bends to the right, leave it and continue straight ahead (marker no. 44) on a tarmac path with the castle park wall on your left.
No markings
(8) At marker no. 43, turn left at a right angle, still on the tarmac path. You will reach the entrance to Courson Castle.
(9) Retrace your steps back to marker no. 43.
Yellow markings
(8) Returning from the château, turn left (east) onto a grassy path that runs between the fields. At marker no. 42 (no sign here), turn right at a right angle. You will come out onto a small road (marker no. 41) and follow it to the left. After about 150 metres, turn right onto Rue de la Galloterie (marker no. 40). At the roundabout, continue straight ahead on the same street. Ignore the alley on the left (which is just an extension of Rue de la Galloterie), then turn left onto Rue de Cocagne (dead end) and go downhill.
(10) Just before the small bridge, turn right onto a narrow path at the corner of marker no. 38. The path first winds between the river on your left and garden fences on your right. Then, leave the riverbank and walk along the edge of a field on your right, on a path that is still narrow and sometimes poorly marked. Pass a sewage treatment plant and continue along the edge of the field. At the end, turn right along a fence on your left. Then turn left onto a very narrow path. At the end of this short passage, between houses nos. 16 and 18, turn left into a street.
Red and white markings
(11) At the crossroads, turn right into Rue de la Butte Bouillon. The street gives way to a path between fields. Climb slightly with a hedge on your right. At the top of the hill, head west, ignoring the paths on either side, alternating between the edge of the woods (on your left), the undergrowth and between the fields. At a place called La Touche, cross the D3 road (take care). Continue straight ahead into Rue des Ormes. Cross a residential area, ignoring the side streets. At the crossroads after the last house (sign saying "No entry" on the left), turn right and follow theGR®®111(ignore the red and whiteGR®®111Csign on the left). The street gives way to a path.
(12) After No. 3 (marker post), turn left onto a grassy path. Pass a school and follow the main street (Chemin des Ecoles) westwards, ignoring another street on the right. At the crossroads, continue straight ahead into Rue de l'Etang, then pass a street on the right-hand side.
Red and white + red and yellow markings
At the next crossroads, turn left onto Rue de la Bourguignette towards the town hall (sign). Go downhill and pass the town hall on the left-hand side of the street. At the bottom of the hill (Place de l'Eglise), turn right and walk past the church on your right.
Red and yellow markings
(13) At the fork (old well), follow the road on the left towards "Le Marais" (sign). Walk first between the walls of properties, then with a field on your left and finally in a wood. After the wood, pass marker no. 47-13.
Orange markings
(14) Immediately after the marker, 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 outward route in reverse: 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 
