104 km around the slopes of Hallasan, South Korea's highest and most volcanic peak
The Jeju100K covers 104 km through Hallasan National Park, tracing a loop around the volcanic interior of Jeju Island. Starting at dawn from Jeju World Cup Stadium, the course climbs through subtropical forest to the upper slopes of Hallasan before descending through ancient lava terrain to the finish. Technical basalt staircases, volcanic rock gardens, and wooden forest boardwalks define the character of the route. Named checkpoint locations — Healing Forest, Yeongsil Entrance, Eorimok, Gwanumsa, Seongpanak — are iconic trails on the mountain.
Experienced ultrarunners
Seogwipo, Jeju, South KoreaOctober 03, 2026
TransJeju Jeju100K is a loop trail race in Seogwipo, Jeju, South Korea, held on October 03, 2026. The course covers 104 km, climbs 3,337 m, and has a 29h cutoff.
Must meet custom qualifier requirements within the qualification window
Valid UTMB Index of at least 50K required to register.
| Location | km | Elevation | Cutoff | Crew | Drop bags |
|---|---|---|---|---|---|
Start Start | 0.0 | 80 m | — | ||
Finish Finish | 102.7 | 81 m | 29h10:00 AM +1 |
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.
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