Access: From Culoz, take the Col du Colombier road. At a hairpin bend, head towards Le Fenestré and return to the car park at the end of the small road. There is a viewpoint nearby.
(S/E) From the car park, turn back and take the first path on the left. Follow this path through the forest until you reach a junction.
(1) Turn left. Stay on the path that winds through the forest until you reach a pasture, follow the almost horizontal trail and you will reach an intersection.
(2) Continue right on the main northbound trail (GRP® markings) and you will reach the Col du Colombier road.
(3) Go up the road, pass a fork to the left and then, 400 metres further up, leave the road and take a path to the left.
(4) Continue climbing along this path, which runs roughly parallel to the road. After passing some pylons, descend to reach the Col du Colombier.
(5) Cross the road and head for the cross.
(6) From the cross, return to the pass.
(5) Descend along the road on the other side, pass a hairpin bend and leave the Granges du Colombier on your right. Continue descending to the next hairpin bend.
(7) Leave the road by heading straight ahead. Follow the path southwards on a generally downhill slope until you reach a crossroads.
(8) Take the path on the left. Continue along this path, which climbs slightly, until you reach the edge of a pasture.
(9) Cross the pasture and reach an intersection.
(10) Leave the path heading south, which descends steeply towards Chanduraz, and take the fairly level path towards a wood. Shortly afterwards, ignore a path on the right and continue along the level track. When you leave the forest, take a left turn to rejoin theGR® at the crossroads you passed on the way up.
(2) Descend via the same route you took on the way up and return to the car park (S/E).