Access: go to Vassieux and continue to the Museum of Prehistory, then drive straight up (towards Col de Vassieux) to Espeline. Park on the right, in the large clearing at the top of the hill.
(S/E) Take the track on the right (west) towards But Saint-Genix.
(1) Turn left onto the track in Combe de Gaza, go through the hairpin bend and follow the forest track on the right until you reach the ridge (sign slightly hidden).
(2) Turn left 180°. Once on the ridge, follow it, pass the Trou de la Fille and reach the Pas Bouillanain.
(3) At the pass, there is a wide view of Saint-Julien-en-Quint below. On the right is the Fond d'Urle plateau, opposite is the Ambel plateau, and in the background is the Roc de Toulaud.
Continue straight ahead through the forest. Be careful at an intersection, as theGR® trail changes direction (do not go straight ahead). Follow the yellow and green markings, climb steeply to the right until you reach a field of yellow gentians, and arrive at Pas Florent.
(4) You can clearly see the climb ahead of you to reach the summit of But Saint-Genix (1,640 m).
Turn around to admire the Grand Veymont and the mountain range as far as Villard-de-Lans. Continue straight ahead to the summit.
(5) At the summit, enjoy a 360° view of the Trois Becs opposite and the entire Diois valley!
Descend steeply to the left towards the Col de la Chau.
(6) Continue towards Entrecol (refuge a little further down), then towards the Col de Vassieux.
(7) Take the time to look down towards Marignac; the trail descends immediately below the sign.
Then climb back up through the woods towards the But de l'Aiglette. The climb is a little steep (watch out for vultures). Continue to reach the edge of the cliff, still climbing, but what a view at the top, breathtaking, the cliff is very jagged, with fantastic views through the rocks of the Aiglette, and continue a little further to the summit at 1,561 metres: view of the Rochers de Chironne above Chamaloc, opposite the Col du Rousset, and to the left the Col de Chironne.
(8) Descend to the Col de Vassieux by retracing your steps, following the signs for Espeline.
(7) At the Col de Vassieux, turn right onto a path, then take an old road to the crossroads, where you turn left onto theGR® marked trail.
(9) At the Baraque Forestière du Plainet, continue along the road on the right for 500 m and, at a bend, turn right onto the forest track (sign on the left of the road) towards Vassieux. This well-used logging track leads down a long descent to another crossroads.
(10) Take the road on the left (ignore the one on the right), pass the wooden hut on your right, take the main road opposite which joins the road a little further on, and you will return to Espeline (S/E).