Bromo Tengger Semeru 100 (BTS100)
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Bromo Tengger Semeru Ultra Run (BTS100) : 07-08 November 2026
Bromo Tengger Semeru Ultra Run (BTS100) is a multi-distance trail event held in Bromo Tengger Semeru National Park, East Java, Indonesia. The event takes place at varying altitude levels and presents routes that run through volcanic sand fields, rural back roads, forest paths, and high-altitude prairies. The course includes sections near the sea of volcanic sand at about 2,200 masl, and offers distant views of Mount Semeru at 3,676 masl and the calm of Lake Ranu Kumbolo at 2,400 masl. Temperatures can be low and wind conditions may be strong in some high-altitude areas.
New and revised distance categories for this edition include an 18 km option intended as a shorter, recreational experience, and a 35 km route that is a revised and extended variant of a previous 30 km course. The event is presented with multiple distance choices to cover a range of trail formats and terrain.
The race is organized by Fonesport and supported by the management of the national park. Practical details such as course maps, schedule, rules, and apparel sizing are provided by the organizer. Visit the organization's website for the most recent information.