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Starting point at the Très Les Pierres Chapel car park.
(S/E) Head north-west and, after about 100 metres, at a fork, take the stony path on the right towards Les Boudimes (the path on the left is for the return journey). Follow this track north-east, which is accessible to forestry vehicles and 4x4s. Walk through the woods on the hillside, passing two waterfalls and ignoring a turn-off on the right towards the hamlet of Villapeyron. You will come out at the Boudimes mountain pastures and chalets.
(1) Continue climbing along the main path that branches off to the left (due north) facing the slope. At the intersection above the chalets, continue straight ahead, following the signs for Les Quebales, Chalet de la Torrens and Les Mattes. Pass under a power line.
(2) At the intersection, continue climbing on the left, still on the main path. Then turn right and pass under the power line again. Along the way, you will pass a sign for "Les Quebales Bas" at an altitude of 1,720 metres. Stay on the main farm track towards "Les Mattes 1H05".
(3) At the signpost for "Les Quebales" at an altitude of 1,790 m, do not go towards "Cornillon" but head towards Chalet de la Torrens 0H15 and Les Mattes (north-west) via a farm track with a gate that descends for 500 m before reaching the mountain pastures.
(4) At Chalet de la Torrens, join theGR®5marked in white and red and follow it west towards Les Mattes via a fairly steep mountain path.
At the first fork, turn right (south-west), temporarily leaving theGR®5via a winding path on a steep slope. After passing through a gate, you will arrive on a plateau where you will rejoin theGR®5on your left. Continue along this plateau, following theGR®5until you reach a barn.
(5) At a place called Les Mattes (the highest point of the hike), begin the descent via theGR®5on the right (west) at the start, then continue along the zigzag path heading due south. Several paths outsidethe GR® have also been created by hikers in this area, so pay close attention to the markings (white and red) on the stones.
(6) At a place called Le Pron, descend to the right, still following theGR®5marked alpine trail, and arrive perpendicularly on a hillside farm track that serves the nearby stables.
(7) Walk a few dozen metres to your right on this track, then continue down another farm track on your left, still through the mountain pastures towards Très Les Pierres (leaving theGR®5, which heads towards L'Étrye). The Étrye stream accompanies you on a gently sloping, slightly winding route.
(8) Ignore a path on the left, cross a small bridge and continue downhill along the stream until you reach a more wooded area. Pass close to the Ertre barn to reach a crossroads near the "Sur le Crac" area.
(9) Follow the same path to the left (north-east) down a descent made of stones and slabs, which requires particular concentration. It is a wooded path with no particular views, which feels rather long due to its fairly steep descent. Along the way, you will pass a waterfall that you can see but cannot access due to its dangerous nature. A municipal fence prohibits access. This last section leads to the chapel car park (S/E).
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