Welcome to UMUK, UK’s only ultraman distance triathlon, established in 2011.

In 2017, UMUK changed hands and was re-designed to ensure athletes and their support crews experience something special and unique.

UMUK offers three exciting events (UMUK 515, UMUK 355 and UMUK Team Relay) in the heart of Snowdonia National Park in North Wales. Large portions of this spectacular national park are designated Sites of Special Scientific Interest, National Nature Reserves, Special Areas of Conservation or Special Protection Areas.

By competing in one of our events you will be racing in some of the most breathtaking places in the United Kingdom.

Our events are widely considered the toughest ultra-distance staged triathlons in the world due to the unpredictable weather and tough elevation profiles, with both long gradual and short but brutally steep climbs. Competing in a UMUK event is an enormous undertaking which requires a huge amount of dedication and determination.

Organisers will select and invite a limited number athletes on a first come, first served basis as the applications are received and following review of your entry form.