About This Event
TransJeju by UTMB stands as the premier ultra-distance trail running event on South Korea's volcanic Jeju Island, offering runners an extraordinary journey through Hallasan National Park, a UNESCO World Heritage site. The race takes place on and around Halla volcano, South Korea's highest mountain, where participants traverse terrain that spans subtropical, temperate, and subarctic ecosystems across different altitudes. The event showcases remarkable biodiversity with over 1,800 plant species that transform dramatically with the seasons, creating ever-changing scenery throughout the race. Runners experience the world's largest forest of Abies Koreana (Korean fir trees), now popular as Christmas trees worldwide, while taking in spectacular views of Baekrokdam crater lake and the dramatic cliff formations of Youngsil Giam with their distinctive rock shapes. As part of the UTMB World Series, TransJeju maintains the high standards and challenging nature expected from this prestigious trail running circuit, combining the technical demands of volcanic terrain with the unique cultural experience of racing in South Korea.
Choose Your Distance
20 km
The 20-kilometer course introduces runners to Jeju's volcanic terrain with 508 meters of elevation gain. This 1 Running Stone event offers an excellent opportunity for newer trail runners to experience the island's distinctive landscape.
60 km
The route explores Hallasan's volcanic terrain through a combination of established national park trails and paths that wind between the island's numerous oreum formations. Runners navigate through sections of subtropical forest before emerging onto more exposed volcanic landscape, with the course design emphasizing Jeju's geological character. The mixed terrain includes both runnable stretches and technical sections over volcanic rock, requiring attention to footing throughout. The course takes advantage of Jeju's compact geography while showcasing the environmental diversity that earned the island its UNESCO recognition. Trail surfaces vary from packed earth to volcanic stone, with some sections following traditional paths used by Jeju residents for centuries. The routing through multiple elevation zones means runners experience different microclimates and vegetation patterns within the same race.
104 km
The 104K course moves through Jeju Island's diverse volcanic terrain, with runners experiencing the full range of ecosystems that make this UNESCO site distinctive. The route incorporates technical sections across basalt formations, the island's characteristic volcanic rock that requires careful foot placement and sustained concentration. Vegetation transitions from coastal subtropical forests through temperate zones, with temperature and exposure varying significantly depending on elevation and proximity to Hallasan.
148 km
The course circumnavigates Hallasan volcano, moving through multiple climate zones as runners gain and lose elevation repeatedly around the mountain's flanks. Volcanic rock sections require technical navigation, while forested passages offer brief respite before the next climb. Water and aid stations are positioned strategically, but runners should expect extended self-sufficient sections given the remote nature of portions of the route.