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The car park at the entrance to the hamlet of La Posterle was chosen because of its location, which, unlike the main car park at Les Sources, does not attract many tourists.
(S/E) Take the road north-west, past the chapel. At the fountain, turn left onto the path. Cross the Posterle stream and continue along the track opposite.
(1) Junction. Continue on the main track opposite. Ignore the path on your left (yellow markings). Arrive at a crossroads (mark 812m) track, paths, continue on the track.
(2) (Mark 907m). Leave the track and turn left onto the downhill path (yellow markings).
Follow the signs for "Les Gillardes" and then "Les Gillardes variante", which will take you to the river.
At the Sources site, take time to visit it all: the resurgence, the confluence and the surrounding undergrowth.
(3) Retrace your steps a few metres. Follow the signs for "Pellafol La Posterle" or "Monestier d'Ambert" on the left bank of the river. Cross the river at the first footbridge, continue along the right bank, the track following the D217 road for a few metres until you reach a new, more marked track.
(4) Take the uphill track and follow it for a few hundred metres before leaving it for the path on the left. You'll come to the Infernet site (approach with caution), a gorge which you can cross via the footbridge to rejoin the left bank. Continue up to the top of the "diversion" and descend to the level of the river.
(5) Head south-east on the Sentier de découverte, towards Le Grand Cros (ignore the left-hand path and the footbridge on your right). The path runs along the left bank.
From Le Cros du Moulin, the trail will take you a little over 1.5km to a fork in the paths.
(6) Take care! Take the path uphill on your left. Leave the direction of Grand Cros by taking the path uphill on your left to complete your ascent. At the top, you come to a large agricultural field, follow it along the edge, past an antenna and a cross to the D537 road, which leads to the hamlet of La Posterle, the parking area for the start.(S/E)
Walker
