This mountain hike begins at the top of the Combatseline chairlift. Follow the Bisse de Chervé until you reach the St-Laurent cabin, before arriving at the natural lake called Lac du Grand Désert (white and red marked mountain trail).
Departure point the yellow sign opposite the arrival place of the chairlift at Combatseline (Siviez).
You can reach Siviez via shuttle bus from Nendaz. Reservation obligatory until the evening before until 5.30pm at Nendaz Tourisme, +41 27 289 55 89.