The starting point for this stage is at the Cabane de Moiry.
White-red-white markings
(S) From the hut, descend towards Lac de Châteaupré.
(1) At the fork, turn left and head for the car park on the north shore of Lac de Châteaupré.
(2) Shortly before the car park, turn left onto a small path that runs along the shore. Head south and rejoin a track. After two bends, you will come to a signpost.
(3) Follow the signs for Lac de la Bayenna and Tour du Lac de Moiry (2500). Cross a stream and continue to an intersection.
(4) Leave the Tour du Lac de Moiry trail (2250). Turn left and begin a beautiful climb towards Lac de la Bayenna.
(5) Heading north, take a balcony path (2500) overlooking Lac de Moiry. You will come to another fork.
(6) Leave the Tour du Lac de Moiry trail (2500) and take the path on the left towards the mountain pastures. Look for the Alpage de Torrent farm in the distance. After a long walk, return to this building, go around it and reach a track.
Yellow markings
(7) As indicated on the sign, keep right towards the Cabane des Becs de Bosson. Follow a beautiful track to Basset de la Lona at the foot of Sex de Marinda. Note a sign indicating Pas de la Lona at 1 hour and Cabane des Becs at 1 hour 40 minutes.
White-red-white markings
(8) Continue along this track, losing a little altitude. Look for a signpost near a small lake.
(9) Continue west to Lac de la Lona (sign: Pas de la Lona 30 min - Cabane 1 hr 10 min).
(10) Begin a new gentle climb to Pas de la Lona.
(11) Facing north, continue climbing towards your final destination. In the rocks, make one last effort for the final 150 metres of elevation gain. Finally, you will discover the Cabane des Becs de Bosson, your accommodation for the night (E).