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Park in the first car park on the right, on the cul-de-sac that leads off the road going up to the ski centre, near the 'Le Cleyat' lodge.
(S/E) Start on the forest road that climbs immediately from the car park, without going as far as the large building a little further on. When you reach a wood storage area, continue for about 50 metres.
(1) Continue straight ahead on the path that continues to climb south towards Col de la Ruchère. Join the GR®9 a little before the pass.
(2) Head right, north-west then north.
(3) After going around the spur, leave the GR®9 and continue on the path that heads south-west towards Aliénard. Reach the pass of the same name: view to the east of the two Som peaks, Petit and Grand, and the ruins of a habert (shepherd's shelter), evidence of past activity.
(4) Continue southwards to reach the magnificent Habert de Billon, still almost intact, not far from the Grande Chartreuse monastery.
(5) Take the path that heads south-west just above the main building and then climbs north and west before arriving at the Col d'Arpison.
(6) Descend towards the meadow and take the time to make a short detour to discover this beautiful spot, particularly popular in winter for cross-country skiing, after climbing the "Noire" from the Ruchère fireplace.
(7) Pick up the trail at the fork northeast of the meadow, which plunges downhill due north. There are several tracks, but if you keep heading north, they will take you back to the car park at the end of the road coming from La Ruchère.
(8) Cross the car park and turn right immediately after a stream to follow the path heading east towards the Nordic Centre.
(9) Once on the ridge, the trail descends slightly south-east to join the GR®9, which you follow to the left, to a place called Le Cerney. You will arrive at the foot of a small cliff.
(10) Leave the GR® and stay on the path that branches off to the right, running horizontally under the cliff to go around it. Once you have gone around the ridge, this path descends rapidly via a series of hairpin bends and returns to the starting point just above the wood storage area.
(1) Turn left to return to the car park (S/E).
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Difficult 
