The start is from the hamlet of Saint-Bruno along the Route de la Colombière (RD4), about 2 km from the village of Le Reposoir (there is a small car park near a stream).
(S/E) Follow the road uphill for about 300 metres.
(1) Heading north, continue right on Chemin de Malatrait. Further up, you will reach the Malatrait chalets.
(2) Continue straight ahead towards Petit Bargy, then after a steep climb, you will reach the Chalets de La Cha. Pass them on your right.
(3) At a nearby intersection, continue left towards Petit Bargy. You will return via the right.
(4) Not far away, at asecond intersection, turn left towards a cave (with a statue of the Virgin Mary), then take a short, slightly rough path. You will then reach another path to follow to the left uphill. Heading north-west, continue through grassy terrain, then rocky terrain as you cross a scree slope. After a few steep sections, you will reach the Col d'Encrenaz.
(5) Heading southwest, continue left on an unmarked path, staying on the ridge and tackling a difficult section that requires a little care. Then continue straight ahead for an ascent, following some orange markings and tackling two successive chimney sections. You will reach a gentler section and join a more marked path: try to note this location for the return journey.
(6) Continue straight ahead, heading west, then southwest, encountering a few unexpected difficulties and tackling two small passes in succession. The route then avoids a peak (elevation 2229), then turns slightly to the right at a large cairn. Reach an unnamed pass.
(7) Be careful, from this point onwards the route becomes significantly more difficult, winding to the right and left around crevasses and following the orange markings and cairns as best you can. A little higher up, continue on a much easier route where the slope gradually flattens out. Reach the summit of Grand Bargy, which is not very marked. Continue for about 100 metres and you will reach another summit marked by a cross.
(8) There are beautiful views from this spot. Retrace your steps with greater caution in this direction.
(6) Shortly before the descent to the Col d'Encrenaz, it is best to follow the less difficult route on the right. After passing through a chimney, bear left (avoid going straight ahead on a more difficult route) and you will soon rejoin the route you took on the way up. Bear right in the second chimney, then left to reach the pass further down.
(5) Continue straight ahead until you reach a short steep section. You will then reach the summit of Petit Bargy.
(9) There are beautiful views from this spot. Head towards the cross and follow another path to the left, heading north-east (blue markings, more or less clearly visible). You will reach an intersection where three paths meet.
(10) Follow the middle path, which is the least marked, heading towards the small, slightly overhanging ridge. Please note that from this point onwards, the route becomes more difficult with some steep sections near crevasses (follow the blue markings): in short, continue along a route that follows a ridge for a short while, then turn right onto a downhill section and continue slightly to the left at the bottom.
(11) Continue south-east, to the right. The path passes near the summit of Tête des Bécus: continue straight ahead, heading south-east on moderate slopes, then steeper slopes with a few rocky sections. Further down, you will reach an intersection.
(12) Continue to the right towards Sur la Cha.
(3) Follow the route back in reverse on the left, taking the carriage road to return to the car park (S/E).