Leave your car at the Col de la Core on the D17, between Sentenac-d'Oust and Arrien-en-Bethmale.
(S/E) Take theGR®®10towards Étang de Bethmale. The path winds down through the forest and approaches the road.
(1) The trail becomes flatter. Follow the contour lines, keeping the road below you for a while, still in the forest. Arrive at Étang de Bethmale.
(2) At a fishermen's hut, turn right, heading north, so as to walk along the lake. Leave a path that cuts the lake in two on your left. Further on, you will reach the end of the lake.
(3) Turn left onto a track that leads to a car park. At the end of the car park, turn left onto a path that approaches the lake and then follows it a little higher up. The path continues to climb and moves away from the lake. You will then reach a fork.
(4) Turn right onto theGR®®10, which winds its way up to a track.
(5) Follow it to the right. A little further on, leave the track and follow theGR®® which turns left. The path comes out of the woods and leads to an alpine pasture below a hut.
(6) Continue on theGR®® which climbs in a hairpin bend and turns back just behind the hut. Shortly afterwards, you will come out onto a track.
(7) Leave theGR®® which goes straight ahead and take the track on the right. Pass close to a small car park, then another larger car park. Continue along this track to the Cabane de Campuls.
(8) Leave the track that turns right and continue straight ahead on a wide grassy path. Shortly afterwards, this path gives way to a small, unmarked trail that resembles a dry stream bed and climbs steeply with very short switchbacks. You will come to a fork with a wooden sign (no inscription).
(9) Turn right, continuing to climb but less steeply, to reach theGR®®10which follows the ridge.
(10) Follow theGR®® to the right for a round trip to the Étang d'Ayes.
(11) Then turn back onto theGR®®, staying on the ridge until you reach the Col d'Auèdole, where theGR®®10and 10D meet.
(12) Leave the path that leads to the hut below and turn right onto theGR®®10D.
(13) Immediately afterwards, at a three-way junction, turn left and continue on theGR®®10D. The path, which is quite challenging, descends to the Col de la Core (S/E).

Then there's a beautiful forest crossing to the superb Bethmale pond, followed by another forest climb, which is very nice.