2300 runners wait for the start of the 170 km Mount Blanc Ultra Trail (UTMB) race around the Mont-Blanc crossing France, Italy and Swiss. (Photo by JEAN-PIERRE CLATOT/AFP via Getty Images)

UTMB Mont-Blanc

The ultimate trail running event, uniting trail runners from around the world, the UTMB Mont-Blanc, Finals of the UTMB World Series, brings together in Chamonix the world’s top elites.