A nocturnal lap of South Korea's volcanic jewel, 148 km through UNESCO-protected Hallasan National Park
The flagship distance of TransJeju by UTMB circumnavigates the volcanic interior of Jeju Island, South Korea's southernmost province. Starting at 21:00 on Friday and running through two nights, the 148 km course threads through Hallasan National Park — a UNESCO World Heritage site — climbing past subtropical forests, ancient lava fields, and basalt staircases to the slopes of South Korea's highest peak. The terrain is notoriously technical: volcanic rock gardens shift underfoot, steep staircases carved from lava demand careful foot placement, and wooden boardwalks through forest sections become treacherous in rain. Runners pass through 11 checkpoints across the island, finishing at Jeju World Cup Stadium in Seogwipo.
Experienced ultrarunners
Seogwipo, Jeju, South KoreaOctober 02, 2026
TransJeju Jeju100M is a loop trail race in Seogwipo, Jeju, South Korea, held on October 02, 2026. The course covers 148 km, climbs 4,057 m, and has a 37h cutoff.
Must meet custom qualifier requirements within the qualification window
Valid UTMB Index of at least 100K required to register. Index must be active at the time of registration.
| Location | km | Elevation | Cutoff | Crew | Drop bags |
|---|---|---|---|---|---|
Start Start | 0.0 | 80 m | — | ||
Finish Finish | 146.7 | 81 m | 37h10:00 AM +2 |
Aid station details for this race are still being filled in. Cutoffs and access rules come from the race’s own published information and can change — check the official race details before planning around them.
Sign in for race-day weather at every station, points of interest, segment-by-segment analysis, pacing, and to save this race to your calendar.
October is Jeju's shoulder season — typhoons are possible and rain can make volcanic rock boardwalks extremely slippery
Conditions can shift rapidly on Hallasan, especially at higher elevations
No required gear specified
No recommended gear specified
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