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Departure from Clairefontaine-en-Yvelines, at the junction between the D27 and D72 roads (traffic lights). Two car parks are available:
- Along the D27, past the junction when coming from Rochefort-en-Yvelines and the A10.
- Behind the church, a few metres up the D72.
Blue and white signs
(S/E) Follow the main road (D27) towards Dourdan/Bullion (east-southeast). After a few metres, at the fork at the foot of the town hall and the war memorial, turn right onto Chemin de l'Essart. Go down gently and turn left at the bottom. Cross a stream, pass a forest gate and continue along the path.
(1) At the fork, turn left onto Sente de l'Essart (rural path no. 3) and ignore the blue and white cross (there are two marked paths that cross here). On a wide grassy path, follow a river on your left. After passing a pond on the right (not shown on the map), go around a pond on the right.
(2) At the end of the pond, leave a small bridge on your left and continue on rural path (SR) no. 3. Walk with a fence on your right, then with a fence on your left. At the end of this fence, turn left at an acute angle and cross a stream on a footbridge made of a single flat stone. Continue with a fence on your left. At the end of the path, follow the D29 road to the left. At Chemin du Moulin (called "Rue" on the map), turn right and cross a lawn, keeping close to a fence on your right.
Blue and white + blue markings
(3) Cross the D27 road and take the Sente des Bruyères opposite. Until the next point, the path is bordered on the left by a wall or private property fence and on the right by the fence of the Centre Technique National du Football (CTNF). Start with an uphill climb and, after a left turn, continue on flat ground through heather and pine trees. After a short descent, at a fork level with a house, turn right and climb uphill.
(4) Cross the end of a paved lane and climb a steep slope punctuated by wooden steps. After another left turn, continue on a slight downhill slope. At the end of this section, turn right at a right angle and follow the (small) roller coaster track, keeping the CTNF fence on your right until you reach a road.
(5) At the crossroads, follow the D72 opposite towards La Celle-les-Bordes (sign). After about 150m and before a large sign saying "Danger! Passage d'animaux" (Danger! Animals crossing), turn left, go through a forest gate and take the Chemin de Rochefort à Vieille-Église in the forest. After a short section of fencing on the left, follow the path with a pine tree plantation on your left and a plot of deciduous trees with ferns in the undergrowth on your right. Ignore a path branching off to the left and continue to a crossroads. Turn right (yellow marker).
Blue and white markings
(6) At the next crossroads (signpost), leave the blue markings on your left and continue straight ahead. Between two plots of deciduous trees, ignore the vague paths on either side and continue to another crossroads (signpost on the ground in November 2016).
Red and white markings
(7) Continue straight ahead on theGR®1with a regeneration plot on your left. At the T-junction, turn left and follow a private forest fence on your right. Descend steeply, cross a stream and climb up opposite. At the next junction with a overgrown path on the left (Carrefour de l'Ancien Étang on the map), continue straight ahead. At the end of the fence (Carrefour Biscornu), continue straight ahead for about 300m.
Without signposts
(8) Shortly before a red and white arrow indicating a right turn, look for two trees on the left with plot numbers 22-19 and 22-18, respectively. N.B. On the 1:25,000 map, only numbers 19 and 18 appear; the "22" refers to the division number, which is written in Roman numerals on the map. Then turn left and take the path that starts (discreetly) between these two trees. Follow this narrow but well-marked path south-west until you come to a stabilised track. Then turn left towards a cross visible in the distance. At the next crossroads, continue straight ahead until you reach the Croix du Grand Veneur.
Blue and white markings
(9) At the crossroads, turn right onto Chemin de Vieille-Église (CR15, signposted). Head south-east on a wide, undulating grassy path, ignoring vague paths branching off to the sides. At the junction with Route Robert Joly (beautiful oak tree behind a fence on the right), continue straight ahead, still on the CR15, then go through a forest gate.
Blue and white + blue signposts
(10) At the junction with Chemin des Nouettes, continue straight ahead on a paved road. Pass a few houses and then descend slightly. Allow the CR16 to come from the left and end up at Place de la Croix. Then follow Rue de Rambouillet to the left, preferably on the right-hand pavement.
Blue and white signposts
(11) Shortly after a narrow section of the street, turn right onto Sente de l'Orme (dead end). At the end, ignore a path on the left (not shown on the map) and cross a stream. Continue west on a wide grassy path bordered by reeds. At the first house, turn left and follow a gravel path for a few metres. When the path turns right, continue straight ahead on a path between two fences. At the end of the fence on the left, continue straight ahead, following the fence on the right. At the T-junction (sign), turn left into the woods. Cross a stream on a footbridge and continue between reeds. At the end of the path, go through a forest gate.
Blue and white + yellow markings
(12) Continue straight ahead on a stony path, leaving the entrance to a retirement home on your left and continuing on the tarmac road. At the stop sign, turn left and take a tarmac path along a pond on your left. At the end of the pond, continue along the street. At the stop sign, turn right and return to the junction of the two departmental roads (S/E).
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