Park in the car park by the lake, near the centre of Chasselay.
(S/E) Go down Rue de l'Etang and, at the crossroads, turn left onto Montée du Plantin. At the top of the hill, leave the castle on your left and continue straight ahead. You will come to an orientation table.
(1) Continue along the geological trail and turn left (ignore the trail that branches off to the right). At the next intersection, ignore the path that branches off to the right. Continue for 1.4 km, south-south-east, ignoring the paths and trails on the right or left. You will arrive at the Borde farm on the right.
(2) Turn right after the ruined farm (leaving the geological trail). Head uphill towards the west, then turn left (due south). You will arrive at the Route de la Glande. Follow this road to the left for 600 metres.
(3) Take the path leading to the Gîte de la Glande. Leave the lodge on your right. Ignore the next path on the left and continue south to the Route du Mont Verdun (you can make a detour to the right to see the quarry battery).
(4) Follow the road up the pass. At an intersection, ignore the road on the left and descend the pass on the other side.
(5) After about 600m, take the path on the left, marked by two wooden posts. You will immediately come to another path; follow it to the left for 150m. Then go down the stairs on the right and turn left onto rural path no. 34. Continue to the Route des Gambins and follow it to the left for about 50 metres.
(6) Just before Chemin des Brosses, climb the path that leads to a meadow, with a drystone shelter on the left. Retrace your steps.
(6) Continue a few steps along the road towards the east and immediately turn left onto Chemin des Brosses. At a fork, turn right and descend along the winding path (there are many drystone shelters to discover).
(7) Follow Chemin de la Maby to the left for 350 metres. Then take the path that branches off to the right.
(8) Turn left onto the tarmac road of Robiat. After about 250m, follow the road on the right that leads to the quarry.
(9) Take the path on the left before the entrance to the quarry and follow it north-east for about 1 km. You will come to a tarmac road. Follow it to the right for about 100 metres.
(10) At the intersection, turn right onto Chemin de la Croix Rampau. After 200 metres, turn left onto Chemin des Places. After another 200 metres or so, follow the path on the left that leads to the Croix Rampau viewpoint (remains of a windmill).
(11) Retrace your steps.
(10) Back at the intersection, keep to the right (Cendre wash house). Follow the path for about 1 km.
(12) At the crossroads, take the path on the left and ignore the path on the right. At the T-junction, turn left. Follow the path for about 800 metres, ignoring all the paths on the right.
(13) When you reach a fork, follow the Chemin de Chasselay to the right. Turn right at the hairpin bend and continue straight ahead at the next fork.
(14) Turn left before the tarmac road. After about 150 metres, turn right onto Chemin de Poleymieux. Turn left along the path, ignoring any turnings off to the sides.
(15) At the T-junction, turn right. Turn left and follow Rue de Génévréant. At the end, follow the D16 road to the left. At the next crossroads, turn left twice to return to Rue de l'Étang and the car park (S/E).
. It's a shame because this hike is really interesting
. As a result, only half of the route could be completed.