Istria 100 by UTMB 168K 2027

Amateur-enterable major trail/ultra running race. Importance evidence: Official Istria 100 by UTMB page says the event started in 2013 and gathers more than 3000 runners from around the world; official race list shows 168K on 2nd April 2027 plus multiple individual distances; UTMB World Series inclusion is major-series evidence.