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Departure from the Saclas town hall car park, located along Rue du 19 Mars 1962, on the left, after the town hall when coming from Étampes via the D49.
Red and yellow + blue markings
(S/E) Return to the town hall and, at the car park exit, turn left onto Rue Joliot-Curie.
No markings
At number 11, ignore the markings that tell you to turn right (this will be the way back) and continue along Rue Joliot-Curie. Ignore a path on the right and, when the street turns left, turn right onto Rue Julien Bidochon. Cross the Juine river over a pretty stone bridge.
Red and yellow signs
(1) Ignore Rue des Louveries on the right, continue straight ahead and cross Impasse Bidochon on the right, Passage des Moulins on the left and Chemin de Grenet on the right. At a fork, continue straight ahead on Rue de la Roche Noire, following theGR®111(ignore a yellow and blue arrow that invites you to turn left). Walk steadily uphill along a pine forest on the right-hand side.
(2) At the end of the tarmac road, at a triple fork, take the left-hand path and walk briefly alongside a copse on your right. Continue straight ahead between the fields, cross a narrow copse and you will come to a crossroads.
Yellow markings
(3) Take thesecond path on the right, which heads north-west and quickly turns west. Walk between the fields towards a small, clearly visible building. At the end of the path (the building turns out to be an EDF transformer), follow a small road on the right for about 50 metres.
(4) At thefirst intersection, turn sharply left onto the road leading to Trapeau. Between thesecond andthird electricity poles, leave the road and take a wide, stable path on the right. Walk along a slight downhill slope, then descend into a wood.
Red and yellow markings
(5) At the bottom, turn right at a sharp angle and rejoin theGRP® du Hurepoix. Follow a stabilised path between a meadow on your left and the woods on your right. Pass a sewage treatment plant and note the source of the Marette stream in the undergrowth on your right. Head back up towards the houses, come out onto a street and follow it downhill to the right.
(6) Just after No. 480, turn right and go down Rue de la Marette. Turn right then left along this street and go back up, enjoying the view of the valley on your left. Come out onto a road and first turn right then left to take a dirt track that goes up to the plateau.
(7) At the crossroads (metal barrier), turn left and walk along a fenced meadow on your right. Enter a wood and walk downhill.
N.B. In August 2021, a fallen tree was blocking the path at this point. You can get around it by following the hedge for 200 m inside the field above the path and rejoining the route by crossing the hedge again. Thanks to Visorandonneur jean-marc.rollin for reporting this.
Ignore a turn-off on the right and continue downhill. You will come out onto the road you crossed earlier. Follow it to the right and enter Guillerval via Rue des Robines.
Red and yellow + blue markings
At the roundabout (former water pump), turn right into Rue d'Andonville. Cross a residential area. Then walk along the left-hand side of a wooded park and then a basketball court.
Blue markings
(8) At the crossroads that immediately follows, continue straight ahead on flat ground along a fence on the left-hand side (ignore the other markings that go up to the right). Cross a wood and continue along the edge of the wood on the left-hand side and the field on the right-hand side. At the houses, continue along a narrow lane.
Red and Yellow + Blue Markings
(9) At the stop sign, rejoin theGRP® and turn right into Rue de Souplainville. Cross a residential area, then walk along a sloping wood on your right.
Blue markings
At the end (end of the 30km/h zone), turn left. Walk along the left side of the Résidence de la Marette and the small lake of Saclas on your right.
No markings
(10) At the pedestrian crossing, turn right onto a small tarmac road that is closed to motor vehicles. Pass between La Marette on your left and the lake on your right.
Blue markings
At the T-junction (bridge on the left), turn right. Ignore a path on the right, take the Pont Michel Baud bridge over the Juine and ignore another path on the right.
Red and yellow + blue markings
At the end of the road, rejoin theGRP®, cross a small stone bridge opposite and follow a tarmac path lined with a wall on the left. After a chicane, turn left onto Rue Joliot-Curie. At the stop sign, you will find the town hall car park on your right (S/E).
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