104 km around the slopes of Hallasan, South Korea's highest and most volcanic peak

No Service Requirement

Does not require trail or volunteer work

Race requires a qualifier

Experienced ultrarunners

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.

This event uses open registration - no lottery entry required.

Valid UTMB Index of at least 50K required to register.

This race does not have a service requirement for entry.