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Access is from Saint-Laurent-du-Pont, on the right bank of the Guiers Mort: go up to bypass the hospital via the small road leading to Provenches and Piquetière, ending in an unpaved road at Le Désert: park opposite the former convent, as the forest road is closed to traffic beyond this point.
(S/E) Go up the path on the right, heading south and cutting across the wide bend in the road. Then follow the paved forest road to the crossroads (823m) indicating the direction of L'Orcière.
(1) Take the wide path on the right, which climbs slightly to the edge of the Orcière meadow and its Habert. Do not go as far as the Habert, but take the path at the entrance to the meadow, which descends in a straight line to the foot of the clearly visible Fétrus rocks.
(2) At the stream bed, join the path that climbs up from Guiers Mort and turn left into the gap through which the intermittent stream flows. Follow the yellow markings carefully on this climb, as the route first follows the bottom of the ravine, through the chaos of rocks disrupted by the stream, before climbing a few switchbacks in the forest on the left bank. In one of these curves, a path branches off to the right, which sometimes disappears and leads to the Rocher du Solitaire. Do not take this path, but instead turn left to continue climbing in hairpin bends while rejoining the stream bed. Head north to cross several branches of the stream until you reach a forest track coming from the right in the forest.
(3) Take the path on the left that continues along it: it approaches the bed of a stream (usually dry), climbs in regular zigzags through the forest, then crosses the stream and continues to climb steadily in zigzags on the forest side of the Rochers de Fétrus. Reach a gentler ridge, which you follow to the right, leaving the forest and reaching the Col de Fétrus below the Rochers d'Arpison, the highest point of the hike.
(4) When you reach a crossroads on this wide grassy ridge, turn left towards the north to begin the descent, initially along a gently sloping path. The path descending from Arpison arrives from the right. The route crosses a wet area where tree trunks in the ground maintain the profile of the path. The slope gradually becomes steeper and the path gradually becomes passable by vehicle. At La Cellière, take a path across one of its wide curves to reach a grassier area at Le Pertuis.
(5) There, a signposted path branches off to the left and leads to the Belvédère du Pertuis viewpoint in 10 minutes.
Retrace your steps to the forest road and descend to Pas du Pertuis, carved into the rocky ridge, followed by two tight hairpin bends.
(6) At the crossroads, you can choose to continue along the road, but this is very long as it makes a wide detour towards L'Orcière. It is better to take the marked trail on the right of the slope: it winds down the hill and joins other trails before reaching the forest road.
Follow this road to the right: it makes a wide curve that takes you back to the starting point (S/E).
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