The Northumbrian

The Northumbrian is an ultimate endurance event held in the stunning Kielder Water and Forest Park, Northumberland. It features full and half Iron Distance triathlons, including a 2.4 or 1.2-mile swim in Kielder Water, a 112 or 56-mile bike ride through scenic valleys and challenging roads crossing the Border, and a 26.2 or 13.1-mile run along forest trails known for hosting the Kielder Marathon. Additionally, ultra trail runs of 50K and 20K with significant elevation gain are offered, both UTMB index events.

The race combines breathtaking scenery, adventure, and physical challenge, with on-course support, timing, and finisher rewards included. Visit the organization's website for the most recent information.