Description of the route

From Champorcher, in the hamlet of Chateau, continue along the road for Dondena going past the village of Grand Mont Blanc.

Park the car and when the dirt road begins, take route 10 on the right on foot, which takes you into Mont Avic park.
First go up the steep path which runs along the stream and leads to the wonderful pastures of Alpe Grand Cort (1944 m), then to the lake and pasture of Muffé (2076 m) and lastly to Col Lago Bianco (2300 m) from where you get a view over the Champdepraz valley.
From here, go down trail 5, past two small lakes, down towards Lac Vallette, and finally to Barbustel refuge. Take route 5C on the left after crossing a bridge that connects Lago Bianco to Lago Nero.
The trail continues diagonally up over Lago Cornuto (2172 m), climbing the final steep section to the Gran Lago (2492 m).