The Source of the Lys.

An evocative 35km route with 1,800m of elevation gain, offering stunning views across the Monte Rosa massif. Departing from Gressoney-La-Trinité, the itinerary follows the Lys Valley upstream, climbing toward the river's source high in the mountains, before descending to finish in Gressoney-Saint-Jean. Along the way, runners cross the ancient Walser paths and villages that have shaped this valley since the 1100s, still inhabited today by the descendants of that historic community. Ideal for those seeking a demanding new challenge, wrapped in the beauty of untouched alpine landscape.

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