The route starts from the Plan district in the commune of Châteauneuf-de-Chabre. From the D942 between Laragne and Sisteron, take the D124 towards Antonaves. Park near a fork in the road or in the car park of the Auberge des Deux Vallées.
(S/E) Head towards Laragne on the D124 and turn left onto the small road leading to the school. At the school, turn left again onto Chemin du Relais and continue to a fork in the road (the path on the left will be the return route).
(1) Continue straight on until you reach the hamlet of Grange Neuve.
(2) Turn left and cross the hamlet. The forest road becomes a track and climbs gently. You will soon see the ruins of an old village, which you go round to the right. Continue climbing, passing to the north of these ruins, and arrive at a large clearing where the view is magnificent.
(3) After taking in the view, continue climbing, following the ridge line more or less. The slope becomes steeper and leads to the summit of Pirivigier.
(4) Continue north-west until, just before a copse, you find a path that veers left (mountain bike trail) and leads to the Serre de la Croix junction.
(5) Take the path on the left that runs along the Grand Serre, heading due south down to a multi-way junction.
(6) When the path branches off to the right, take the yellow-marked trail descending to the left. Note: after about 150 m, turn right (yellow marker on a stone). The slope becomes steeper and you will soon look down on the village of Châteauneuf-de-Chabre. Follow this path back to the forest road you started on, just below the hamlet of Grange Neuve.
(1) Turn right and, following the route back in the opposite direction to the outward journey, head towards the Plan district (S/E).