With its 2540m altitude gain, the Mont-Blanc Marathon is the weekend’s flagship race.It brings together the best runners in the discipline, who fight a breathless battle in a dream setting! First on the fast, rolling trails of the first part of the race, then on the steep, technical slopes of the aiguillette des Posettes, the main difficulty of the course, to finish facing the incredible panorama of the Mont Blanc range.To take part in this race, it is recommended that you have good mountain running experience, that your are comfortable on all types of terrain and are self-sufficient for several hours. We draw your attention to the fact that a runner with an UTMB performance index of less than 350 points has very little chance of finish the race, so it is recommended that you take part in another Mont Blanc Marathon event.