Departure from the (beautiful) church in Granges-le-Roi.
(S/E) Leave the village via theGRP® du Hurepoix, heading south-east (red and yellow markings). This takes you across open fields and then through two valleys to La Foret-le-Roi. 3.5km.
(1) In the centre of the village, follow the red and white markings ofthe GR®111c trailheading north-northeast along a small road (known as Route de Plateau) which takes us back to the second valley.
(2) Leave this road and turn right onto a path (still marked). Just follow this valley: there are no houses for 3.5 km, the valley is steep-sided and bordered by woods on its heights; beautiful farmland below, climbing towards the plateau where possible.
(3) As you approach Venant (200m before; elevation 100), leave theGR® and turn sharply left (west). The path, which is now unmarked, climbs towards a quiet, clear road that leads to Marchais. Leave this road after following it for 900m.
(4) Turn left (elevation 154) and follow a beautiful path towards La Beauce for 2.8km. The curious will wonder about the nature of the building on the horizon, due west. It takes us back to the D836 road (Dourdan towards Etampes).
(5) Follow it (to the right) for 400 metres, then turn left. Next, turn right, then left to return to the car park (the mystery of the building will have been solved). (S/E).