TransJeju by UTMB® 2026

Listed as a UNESCO World Heritage site, the island of Jeju, south of South Korea, offers a spectacular natural setting to host the TransJeju by UTMB® 🌋. This official UTMB World Series event invites runners to traverse an island shaped by volcanism, between craters volcanic, ancient lava tubes, forests, and wild coasts. Held in the fall, the race highlights the natural and cultural wealth of Jeju, renowned for its exceptional biodiversity and contrasting landscapes. Several trail formats are offered, allowing everyone to gradually immerse themselves in this unique environment, from discovery trails to long-distance adventures.

The TransJeju by UTMB® course explores some of the island's most iconic sites 🌿. The longest formats take runners up to Mount Hallasan, the highest point in South Korea, with a memorable passage by the crater lake located at its summit. Other distances offer the chance to discover panoramic trails leading to the village of Gaisiri, known for its traditional culture and preserved natural setting. Throughout the route, the landscapes alternate between volcanic areas, natural paths, and coastal sections, offering a rare variety in a single event.

What makes TransJeju by UTMB® truly unique is its island and volcanic nature 🌏. Running on Jeju means evolving on land recognized for its biodiversity, with over a thousand subtropical plant species and an omnipresent nature. The event is designed to highlight this richness by offering a sporting journey that tells the geological and cultural story of the island, going beyond mere performance.

The experience far exceeds the race itself 😄. The organization benefits from UTMB® standards, with an international atmosphere and a warm welcome. Jeju is also a popular destination for its infrastructure, local traditions, and cuisine, particularly focused on seafood products. Participating in TransJeju by UTMB® is a real sporting journey, at the crossroads of trail, discovery, and Korean culture.

An ultra on a UNESCO-listed island... it's hard to find a more exotic setting 🎽.