Park in the large Correrie car park.
(S/E) Return to the D103, follow it for a few metres to the right, then turn right to head north on the road leading to the Grande Chartreuse Monastery.
(1) Walk alongside the monastery and arrive at the Habert de Billon track junction.
(2) Take the track on the left. Further up, after the small tunnel, you will reach the Habert de Chartrousette crossroads.
(3) Keep right (north) and follow an easy climb to reach Habert de Billon.
(4) You will come to the junction with the Col de l'Aliénard trail: leave this trail on your left and take the trail on your right leading to the Prairie de la Folie. Continue north-east and you will reach the Col de la Ruchère.
(5) Turn right (south) and begin the descent. Bear southeast and enter the forest. Continue descending and you will soon reach Notre-Dame de Casalibus.
(6) Take the wide track on the left that joins the Habert de Billon track.
(2) Follow the same route back to the Correrie car park (S/E).

abundant snow