From La Chapelle-en-Valgaudemar, take the road towards the Accro-branche site, continue until you reach the hamlet of Les Portes, and park in the first car park.
(S/E) From the car park, continue along the road towards the hamlet, pass it and continue uphill on the track until you reach the second car park (La Fouronnière).
(1) At this point, follow the path to the right of the stream towards the Col de La Béranne for about 500 metres.
(2) At the crossroads, turn right towards Col de la Béranne. A long winding climb offers beautiful views of the surrounding waterfalls. The trail continues to climb, passing over a small lake (unnamed) and heading towards the pass.
(3) Once you reach the Col de La Béranne, take a short break on the narrow ridge to enjoy the beautiful panorama. Turn right towards the Col de Pétarel on a path along the mountainside to quickly reach the Col de Pétarel.
(4) Once at the pass, turn right onto the path that descends towards the Lacs de Pétarel. Two lakes appear below on the right: these are the Lacs de Sebeyras. Continue the descent above one of these lakes without ever reaching it (you will need to make a small detour off the path to get close to it). Continue downhill to pass the landing point and see the Lacs de Pétarel.
(5) After admiring these beautiful sights, take the same path to begin the descent towards Les Andrieux. Immediately, a last small lake appears, then the descent begins in earnest.
(6) Further on, at the first crossroads, turn right towards Les Andrieux.
(7) At the next crossroads, in the forest, turn right again towards Les Andrieux.
(8) At the third crossroads, still in the forest, turn right towards Les Portes (leaving Les Andrieux on your left). The path runs along the side of the mountain for about 3 kilometres with a few tricky sections, but nothing too difficult.
When you reach the hamlet of Les Portes, turn left onto the road to return to the car park (S/E).
, you often come across chamois around the lakes.