Istria 100 by UTMB in Istria region
Istria 100 by UTMB, launched in 2013 with just 237 runners, has grown into a UTMB World Series ultra-trail race drawing over two thousand competitors from more than sixty countries, with routes from Labin, Buzet, Motovun and Groznjan converging on a finish in Umag. It is now among Croatia's largest organized trail running events.
Istria 100 by UTMB began in 2013 as a modest trail running event with only 237 competitors, designed for a small group of dedicated ultra-runners rather than a mass-participation race.