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To get to the starting point, from Bonneval-sur-Arc, head towards Col de l'Iseran and drive for about 9km. Park just before Pont de l'Oulietta (car park on the right).
From Val d'Isère, cross the Col de l'Iseran and head for the car park at the bridge, about 3km after the pass.
(S) Take the trail (GR® du Pays du Tour de Haute Maurienne) at the corner of the road and the car park. This climbs south-east before reaching the balcony trail. Then it becomes easy; pass under the Pointe des Arses and reach the small Lac de Plan des Eaux.
(1) Cross the lake's spillway and continue along the trail towards the east. It goes around the Ouille des Reys and, after a short steep climb, leads to a crossroads at the small Lac du Pys.
(2) Please note: the lake is almost invisible from the balcony trail. Turn left and make a round trip to Lac du Pys.
Then follow the path down to the Ruisseau du Montet footbridge and climb back up opposite. After a few hairpin bends, the path heads east again, descends slightly, crosses the Ruisseau de Plan Sec and joins a path downhill on the right.
(3) Continue opposite to the Carro Refuge (2,759 m) in its superb mineral setting.
(4) Behind the refuge, you will reach the Lac Blanc and Lac Noir lakes, separated by a vegetated moraine.
(5) Then return to the Plan Sec crossroads.
(3) Leave the path you took on the way up and turn left downhill. This path crosses the Plan Sec stream footbridge and joins a small stone bridge over the Montet stream with a beautiful view of the waterfall on the right.
(6) Continue downhill and join the track on the right bank of the Torrent de l'Arc.
(7) Continue right along the path to the Pont-Saint-Clair car parks. Do not cross the Arc (leave theGR® du Pays du Tour de Haute Maurienne) and continue along the small path on a short climb to the right. The hamlet of L'Écot is just behind.
(8) Cross the hamlet and continue along a path that follows the valley downhill on the right bank of the Arc. Ignore the paths on the left and continue to Bonneval-sur-Arc. At the entrance to the village, take the street on the right that climbs a few metres, then the one on the left downhill. Cross the D902 in front of the Tourist Office and continue a few metres downhill to the bus stop on the left (E) or the village centre with its numerous car parks.
Tourism professional
Very difficult 
Visorando member
Moderate 
