This hike begins at the top of the Combatseline chairlift. Follow the ancien bisse de Chervé until you reach the St-Laurent cabin, before continuing along a mountain path to the lac du Grand Désert and its breathtaking mineral landscape.
Depart from the yellow signpost near the top of the Combatseline chairlift and follow the ancien bisse de Chervé, an Alpine bisse where you encounter some steep and vertiginous passages. Admire the view of the turquoise lake of the Cleuson dam and continue along this ancient bisse towards the St-Laurent cabin where you can stop for a bite to eat. Then set out towards the lac de Grand Désert. This path is marked in red and white and requires a certain level of technique and endurance to reach the Grand Désert mountain lake and its rocky and mineral universe. Return to the Cleuson dam lake by the same route. Then follow the path along the lake, cross the dam wall and then turn right onto a footpath which zigzags downhill below the dam wall. Once at the bottom, follow the signposts towards Siviez.
Departure point the yellow sign opposite the arrival place of the chairlift at Combatseline (Siviez).
There is free parking at the bottom of the chairlift.
You can reach Siviez via bus from Nendaz. Timetable available at www.cff.ch.