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Reach Plan Lachat via the D902 and park on the large grassy area used as a car park.
(S/E) Take the military track leading to the Col des Rochilles (you can also take a parallel path). Continue until you reach a crossroads with a good path.
(1) Take the grassy track that runs alongside the Ponsonnière stream, passing close to the Jargette and Mottets chalets. Go around these and follow the Ponsonnière stream on its left bank.
(2) Continue along the left bank and climb steeply to reach the Col de la Ponsonnière.
This is the highest point of the hike. The view is superb:
- to the south, the Grand Lac,
- further east, the Lac de la Ponsonnière,
- to the west, Lac Blanc, which is not visible.
(3) Take theGR®57on the left, which descends gently north-east towards Lac des Cerces, where you can see the spectacular Rochers de la Sama to the east.
(4) Walk along the lake, then turn left towards the Col des Cerces, which you will reach after a short climb.
(5) Continue to the left, leaving theGR®57 trailthat leads to Lac Rond, to reach Lac du Grand Ban via Col des Rochilles.
(6) Take the path on the left and pass the Rochilles military camp. (From Col des Rochilles to the camp, you can take the path that avoids the road; it is a little steep, so be careful if you are with children. On the right, you can see the climbing rocks. They are equipped but spectacular).
(7) Leave the road on the right and descend the path along the right bank of the Jargette stream to reach the crossroads of the circular route.
(1) Retrace your steps to return to the car park (S/E).
Visorando Member
Very difficult 
Difficult 
