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To reach the start point from Serres, head towards Grenoble and then, on leaving the town, just before the bridge, turn left towards La Piarre. In the village, turn left towards Le Vissac and park after the last house in the hamlet, at the side of the track.
(S/E) Take the stony track to start the hike. It is about 7 km to the Col d’Arron; the track climbs gently. It is pleasant and mostly shaded, offering some lovely views over the Aiguebelle valley.
(1) Continue straight ahead on the track, ignoring the path you will take on the way back.
(2) Do the same at the hairpin bend and carry on.
(3) The start of the climb up the Duffre is marked by a signpost just before you reach the Col d’Arron. Ignore it and carry on until the track turns sharply left.
(3) Leave the track and turn right. The ascent of the Duffre can be started from this point; there are a few cairns to guide you.
(4) At the summit of the Duffre, take the path on the right which descends towards the Pyramide and then climbs back up to its summit.
(5) Descend the other side of the Pyramide, following the ridge to the path on the right marked by a post.
(6) Take this path and follow it down to rejoin the stony track. Follow it to the left until the second hairpin bend, then head back down to the path on the right marked by a red and yellow sign on a tree (GRP® Tour du Buech).
(2) Take the path, which turns into a grassy track a little further on, until you cross the stony track again.
(1) Cut across this track and continue straight ahead on the grassy path to the starting point (S/E).
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Difficult 
