Go to Saint-Julien-en-Beauchêne on the D1075 road (between Lus-la-Croix-Haute and Aspres-sur-Buëch) and park in the large car park in the village, at the side of the road (opposite the Hôtel des Alpins).
(S/E) Cross the road carefully at the pedestrian crossing, then walk back up into the village to reach Rue du Dauphiné.
(1) Turn right, following the signs for "Durbon" to reach the road leading to the former Durbon Charterhouse. Turn left, pass the Ecomuseum, leave the village and walk past the multi-purpose hall. Continue to the large triangular crossroads.
(2) Leave the Durbon road. Turn right and cross a wooden bridge, then take Chemin des Eycharennes heading east. Walk alongside a poultry farm until you reach a three-way junction with a no entry sign.
(3) Continue straight ahead along the farm track that runs alongside a meadow, heading east, leaving the track that turns left. Follow it for about 250 m until you reach another fork.
(4) Continue along the track that climbs opposite, heading east, then quickly leave it to follow the GRP® (Yellow and Red) marked trail that turns right towards the south, then south-east into the Commandieu ravine. The path climbs and becomes more limestone, before becoming more wooded as it runs along the bottom of the ravine. Cross to the left bank of the dry stream, then cross back to the right bank, following the forest path. After a bend, join a wide forest track with a directional sign.
(5) Turn right towards La Faurie, heading south, following the markings. The track climbs very slightly until it reaches the Col de la Bécha, which is a wide crossroads of tracks lined with forests.
(6) Continue straight ahead on the forest track towards Piarards, heading south-west. Climb gently to reach the summit dome of Piarards, marked by a small IGN marker and a pile of stones around it. The view is unobstructed on all sides: you can see the peak and Roc de Garnesier to the north. A little further on, you can look out over the Grand Buëch valley.
(7) Return via the same track to reach the Col de la Bécha: marker 617.
(6) Take the track on the right towards La Faurie, heading south-east (Chemin des Piarards). Descend eastwards before making a wide turn to head south-west into a grassy area (meadows) where you will join a stony track.
(8) Continue along the track opposite, heading south-west, to descend along the Rif de Baumugne. Pass under a cistern and you will soon arrive at the hamlet of Baumugne, nestled against a rocky outcrop.
(9) Continue straight ahead to cross the hamlet, leaving the GRP® Tour du Buëch. Behind the few houses, you will see an opening in the rock: this is the Baumugne cave refuge. And on leaving the village, visit the restored chapel (if open). Continue down the small road called Chemin de la Chapelle until you reach an organic cheese dairy (cow) and a crossroads.
(10) Continue straight on Route de Beaumugne, heading west, ignoring Chemin du Rif on the left. The road then turns and heads north until it joins the D1075 at a place called Le Pont Bleu.
(11) Cross the D1075 with extreme caution (no protected crossing) and then cross the Buëch river on a metal bridge, just before the railway line without a barrier. Turn right immediately before the railway line to take Chemin du Poète, which follows the course of the Buëch river northwards: do not take the second path that runs alongside the railway line. Walk between the river (on your right) and fields and gardens (on your left) until you reach a junction between the railway line and the Buëch river.
(12) Turn right to cross the Buëch river on a footbridge that leads to the D1075 and the car park (S/E).