(UTMB)

UTMB, or Ultra-Trail du Mont-Blanc, is an extreme trail running race that circles the Mont Blanc massif, crossing France, Italy, and Switzerland. Covering approximately 170 kilometers (105 miles) with around 10,000 meters (32,800 feet) of elevation gain, it challenges runners with steep climbs, rugged terrain, and variable weather. Participants must be highly trained endurance athletes, as the race tests stamina, mental focus, and adaptability over multiple stages and harsh conditions. UTMB is considered one of the most prestigious international trail running events and attracts competitors from around the world seeking to conquer its demanding course.