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Departure from the car park at the La Plaine climbing site, between Veynes and Gap.
(S/E) From the climbing site car park, cross the stream at the footbridge immediately after the car park. Follow the path to a small building.
(1) Turn right just before it and climb the embankment via the path, cross the platform and continue on flat ground to go around the bottom of the rocky outcrop. Behind it, walk 10 metres along the path that climbs up and then descend a few metres through the broom along the rock slab, then take the horizontal path that runs along the stream and leads to a track after passing a small bushy slope.
Turn left. The path quickly levels out and gives way to a trail at a water reservoir.
(2) Turn left immediately after the sign for Col des Sérigons.
Follow this path, continuing in a north-westerly direction (except for a small bend towards the start).
Ignore the path that branches off to the right further up and another to the left shortly afterwards.
(3) Once you reach the forest track, turn right and then go straight ahead at the junction 150 metres further on. Follow this track, which descends gently to the slight bend on the right.
Look for a row of five large fir trees on the slope above.
(4) Climb the half-earth, half-rock embankment right next to a small fir tree at the edge of the track.
After the first 10 metres, which are slightly tricky and steep, continue the climb, which is now easier, between the branches and then the broom. Zigzag straight up to the entrance to Le Pertuis.
(5) Inside, the rocks are a little slippery at the start to reach the first chamber.
The tour continues until you pass under the cauliflower at the bottom of the second chamber.
After that, to descend deeper, the ground is very slippery, but it is possible to attach a 20-metre rope to a plate flush with the ground on the right after the cauliflower to explore the last part before the final obstruction at approximately -35 metres.
To return, rejoin the track.
(4) Turn right and retrace your steps.
(3) Continue along the track, which descends gently. After the bend, continue for about 120 metres.
(6) Turn left down the yellow marked trail. After the small switchbacks at the start of the trail, keep heading south. Ignore the various trails on the left (one trail crosses the stream, then two old logging trails). Continuing in this direction, you will come to a post with three signposts.
(7) Turn left and continue straight ahead until you cross the valley. The trail heads southeast and continues in this direction until it reaches the flat plain. Ignore the trail to the campsite that branches off to the right (just after the streams at a place called La Mèque).
Continue straight ahead (southeast) until you reach the track. Turn left and follow the track, which passes in front of a small building.
(1) Return to the starting point and follow the path across the footbridge to reach your car (S/E).
, no need for crampons, the slopes are dry.
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Easy 
Extremely difficult 
Very difficult 
