The Marathon of approx. 43 kilometers with a positive elevation gain of 2400 m starts from the town center. This is a trail that gets right into the swing of things, with a 1700-meter climb in the first few miles. It will be well worth it! Once through the Vallon de Youla and skirting Mont Nix, competitors will arrive at altitude at the Col du Berrio Blanc, where the course winds along a spectacular ridge with views across to Mont Blanc. After enjoying the views at Col Chavanne, enchanting and unexplored trails lead to the Colle di Bassa Serra and, after passing the picturesque Lake Tormotta, to the Colle del Piccolo San Bernardo. The long final descent takes competitors back down to La Thuile, passing through Riondet and the forests of the ski slopes.