Start from the car park at the lake in Chasselay.
(S/E) Walk up Rue de l'Etang for about 50 metres, turn left, then right onto Rue des Darbonnières.
(1) Follow the path on the left for 200 metres, then turn right onto Chemin de la Forêt. Ignore a path on the left and, at the fork just after, keep to the right. When you reach another fork, turn left and follow the path, which makes a hairpin bend further on.
(2) At a junction, turn left for a few metres to see the statue of the Madonna, slightly below the path. Be careful of the steep drop, which can be dangerous.
Retrace your steps for about 50 metres, then turn left and follow the path that zigzags uphill; as you pass, you will see a collapsed drystone shelter.
(3) Ignore the paths branching off to your left and continue to a T-junction.
(4) Turn right onto rural path 12 to reach the Geological Trail.
(5) Turn left onto the Geological Trail, rural path 27. Follow this path, ignoring the paths and trails on your right and left, and continue to the Mont Py road.
(6) Turn left onto Chemin de la Carrière, then left again 30 metres further on to go around it. Continue straight ahead to the end of the path, which leads to a small road.
(7) Turn left onto Chemin de Chasselay, then keep right at the next fork.
(8) Take a path on the right that leads to the Ermitage Saint-Antoine. Turn back and continue to the right. Ignore the two paths on the left and you will come to a fork. Take the path on the left, which goes downhill. Ignore the path on the right (elevation 289) and continue for about 100 metres until you reach the tarmac Chemin de la Collonge.
(9) Turn left for 150 metres, then turn right onto Chemin de Poleymieux and continue straight on until you reach the junction with Chemin de la Forêt. Turn right, then continue left onto Rue de Génévréant. Then take the first left, Rue des Darbonnières, then two right turns to return to your starting point (S/E).
