Bromo Tengger Semeru 100 (BTS100)
Semeru, Indonesia • 8-9 Nov 2025
Event details
BTS100 is an ultra run held on 8-9 November 2025 at TNBTS East Java. The event is organized by Fonesport / F-One Sport and offers multiple race distances. Open registration runs from 30 December 2024 until 13 October 2025. Registration closes on 13 October 2025 or earlier if all places are sold.
- 170 km
- 102 km
- 70 km
- 30 km
- 8 km
Course and terrain
The race runs inside Bromo Tengger Semeru National Park and includes high-altitude sections. Participants will pass a sea of volcanic sand at about 2,200 masl, rural back roads, forest paths, and prairie areas. The route provides views of Mount Semeru (3,676 masl) and Lake Ranu Kumbolo (2,400 masl). Weather in the high-altitude areas can include low temperature and strong wind. Course maps are available for each distance. Visit the organization's website for the most recent information.