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(S) From the Torchon chairlift car park (1,125 m), follow the track that climbs to the right (south-east) then take the path that branches off to the left (La Joux: signposted Lac de Pététoz). You will already have a beautiful view of the Roc d'Enfer straight ahead. The track climbs gently through the Pététoz forest, making a few bends. You will see the Pointe de Chalune and the Pointe de Chavasse from left to right. At the first fork, keep right.
(1) When you reach a fork, turn left, still heading towards the lake. A little further on, you will see another signpost and follow "Source du Brevon".
(2) Shortly afterwards, climb up to the right into the forest (wooden sign "Lac de Pététoz"). The path is steep and winds its way up, but you will soon reach a small hill with the lake below. You will reach the lake in a few steps.
(3) From the end of the lake, follow the signs for "Chalets de Pététoz". The path continues to the right and climbs quite steeply, winding its way up (yellow signs). You will reach a small rocky outcrop, which you can cross easily on the right; however, caution is advised in wet weather. Continue to the left, more or less on level ground, following the yellow markings until you leave the forest and come out at the bottom of the Pététoz pasture.
(4) After crossing a stream, you will see the Pointe de Pététoz (Auvellaire) on your left. After a short climb, you will reach the signpost for the Chalets de Pététoz (1,535 m). There are beautiful views, particularly of the Roc d'Enfer, the Pointe de Chalune and the Col de Vésinaz. You can clearly see the Rochers de la Mottaz to the north (on the Pointe and the Bry), the Montagne d'Hirmentaz, the Pointe de la Gay and the Jura in the distance. Head towards La Joux to begin the descent. You will come to a track which you follow until you reach the fork you came to on the way up.
(1) Then take the same trail you took on the way up to descend to the starting point (E).
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