BTS 100 Ultra

BTS 100 Ultra is an international trail running event held in the stunning landscape of Bromo Tengger Semeru National Park (TNBTS), East Java, Indonesia. The race challenges runners to conquer extreme terrains across forests, savannas, rolling hills, and volcanic sand plains surrounding Mount Semeru. With race categories ranging from 8 km to 170 km, BTS 100 Ultra tests both physical endurance and mental strength while offering an unforgettable running experience through one of Indonesia’s most breathtaking natural settings—celebrating sportsmanship, resilience, and environmental preservation.