Park in the village square in Marnans.
(S/E) Head east on Chemin de l'Abbaye, with Olagne on your left. Then take a steep path that climbs to the hamlet of Les Clercs (pretty adobe houses).
(1) When you reach the hamlet, take the road on the right and almost immediately take a path on the left and climb steeply along a villa fence. Take the road that climbs to the right, veering south, until you are about a hundred metres before the water tower. Turn left onto the track to the Étang des Mermes (herons, ducks, reed beds).
(2) Go around the pond on the right (you can walk along the dyke only). On the other side, take the path on the right at the end of the dyke and you will soon find the "Combe des Mermes" sign in the woods.
(3) Take the path on the left, going straight ahead at first, then turning left at a fork and continuing straight ahead until you reach a T-junction, where you turn right. Cross two valleys via small wooden bridges and cross a small stream. Climb up the other side and turn left towards the north-west.
(4) Immediately afterwards, walk along a small private pond (ducks) on your left. Climb up a path of large stones that descends slightly in a bend to cross a valley and climbs back up through the woods to the hamlet of Gros Jean, ignoring two paths on the left, a path on the right (towards a few houses; Le Martinon), then two more paths on the left (the first of which is marked in yellow).
(5) At the hamlet of Gros Jean, at the crossroads, descend to Marmans (S/E) via the small road that branches off to the left (south-east) then, at the T-junction, take the hairpin bend to the right (west-south-west).