The Northumbrian

The Northumbrian is an ultimate endurance triathlon event set in the picturesque Kielder Water and Forest in Northumberland. This challenging competition features both full and half-distance iron triathlons, incorporating a 2.4/1.2-mile swim, a 112/56-mile bike ride, and a 26.2/13.1-mile run along scenic forest trails. The event, which first took place in 2022, emphasizes adventure and achievement, attracting a limited number of participants.

Scheduled for its fourth edition in June 2025, entrants receive various perks, including a cycling jersey, swim cap, electronic timing, and on-course support. Visit the organization's website for the most recent information.