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Park at the Pont des Allemands car park on the access road to La Correrie.
(S/E) Head north along the track – closed to vehicles – leading to the Grande Chartreuse Monastery and follow it to the monastery.
(1) Turn left and follow the track to the bridge over the Ruisseau de Saint-Bruno. Cross it and continue slightly uphill in a south-westerly direction.
(2) Pass through the short tunnel before reaching a large crossroads. Turn right, heading due north, and follow a gentle path to Habert de Billon, a large building overlooking the mountain pasture.
(3) Head right, across the centre of the meadow, towards the Col de la Ruchère and, after about a hundred metres, ignore the path continuing straight ahead (marker) and turn left onto the path towards the woods leading to the Col de l’Aliénard (please note that this path is clearly visible on the ground but much less so on the IGN map; indeed, it is not highlighted, but merely indicated by black dashes). Reach the Col de l’Aliénard.
(4) Begin a short descent which ends at the Tracol false pass and rejoins theGRP®® Tour de Chartreuse trail.
(5) Follow it to the right and you’ll soon reach the third pass, the Col de la Ruchère, a crossroads with five directions.
(6) Straight ahead, head downhill across the meadow along the path heading south until you reach the edge of a wood. Continue down a short but steep descent until you reach the junction at Bourdoire.
(7) Turn right and head for the Chapel of Notre-Dame de Casalibus.
(8) Shortly afterwards, you’ll come to a wide track; walk alongside a large water reservoir, continue southwards and reach the crossroads by the Ruisseau Saint-Bruno bridge.
(1) Then follow the route you took on the way out to return to the car park (S/E).
Visorando Member
Very difficult 
Difficult 
Tourist office
