ISTRIA 100 by UTMB started in 2013 and today it gathers more than 2500 runners from all over the world. In 5 distances, 100 miles, 110k, 69k, 42k and 21k, courses combine every aspect of Istria: difficult and technical terrain, little bit of coasteering, old medieval towns, deep forests, city centres, muddy wallies, streams and brooks, canyons and many beautiful panoramas. Click Here to View Location Information on Google Maps