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At the top of the "Le Rosay" cable car (upper station) at an altitude of 1,445 m.
(S/E) Take the southbound tarmac path.
(1) Ignore the tarmac path on the left leading up to the Col de Châtillon and head south towards Covaleux (30 minutes).
After a few minutes, pass three alpine farms on the right, then the path descends alongside an unmissable alpine pasture on the left, accessible via a forest path. Ignore these and concentrate on the path that runs parallel to it just below on the left.
(2) Take the path on the left that heads east towards Covaleux.
(3) At a place called "sous les Arces", head east towards Covaleux.
(4) From Covaleux, go up the path and then the trail heading north to reach the Col de Châtillon path very close to the farm (where you can get something to eat).
(5) Turn left to climb up to the pass.
(6) On the Col de Châtillon path, turn right onto the wide track leading eastwards and, after several bends, ending at Mont Lachat de Châtillon.
(The route on the IGN map is approximate; the author's GPS route follows the actual path).
(7) At the large area where the cable car arrives, cross towards the south-east and pass to the right of the operations chalet to take a path leading up to the viewpoint.
Descend all the way down the service road to the Col de Châtillon.
(6) Turn right onto the path descending north-west to reach the initial crossroads.
(1) Turn right towards the return cable car (S/E).
Visorando member
Difficult 
