Access via the D526 from Allemond, towards Col du Glandon. 1.5 km after Rivier d'Allemond, and before the descent, turn left onto the old road to the pass, which has been washed away by a landslide. Turn around at the start of the trail and park on the left side of the road.
(S/E) Go back and take the path that climbs towards the lakes. Get ready for a steep 800 m climb. Cables, which are not very useful, secure the first bars, and high concrete steps create a giant staircase to stabilise the ground. Continue to Lac de la Sagne.
(1) Go around the lake on the right and, just after the EDF building, turn right to reach the ridge near the post. From there, there is no more trail, so you have to navigate by sight. After the ridge, you will come to a valley cluttered with boulders. Take advantage of the grassy areas on the right bank (left) to make the climb easier. Reach elevation 2356 and descend to Lac de l'Agnelin.
(2) The Col de l'Agnelin is clearly visible to the right of the summit. Go around the lake on the left and head straight for the pass, using the grassy passages and the least steep snowfields where possible. Access to the pass is blocked at the start of the season by a steep snowfield and a narrow stretch of rocky scree, but it can be reached without difficulty.
(3) From the pass, descend a few metres towards Lac de l'Âne and head left, due north, crossing a maze of easy, cairn-marked ledges. At the last cairn, climb back up towards the ridge and reach the summit.
(4) After enjoying the scenery, return to the pass.
(3) Begin the descent and, keeping to the right, join the Ruisseau de l'Agnelin and then, when you can see it, Lac du Cos.
(5) Walk along the lake on the left and join the trail that connects the lakes (GRP® Tour des Lacs des Sept Laux).
(6) Continue towards Lac Jeplan, then towards Lac de la Corne. Follow it and join Lac de la Sagne.
(1) From here, descend to the car park, following the same route you took on the way up, until you reach the car park (S/E).