The Northumbrian
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The Northumbrian
The Northumbrian is a multi-discipline endurance event held at Kielder Waterside in Kielder Water and Forest, Northumberland. The event runs in summer 2026 and admits a limited number of individual and team entries. It combines triathlon formats, aquabike and UTMB index ultra trail runs on forest and quiet country roads.
Entry requirements vary by discipline. Triathlon and team relay entrants must hold a British Triathlon race licence or purchase a single use race pass. Age restrictions apply to certain races. Race entries include an event jersey or running T shirt for individual entries, a swim cap for triathlon entrants, electronic timing chip, on course support and nutrition, a finisher medal and a goody bag, and parking.
Distances offered:
- Full Iron Distance: Swim 2.4 miles, Bike 112 miles, Run 26.2 miles
- Half Iron Distance: Swim 1.2 miles, Bike 56 miles, Run 13.1 miles
- Half Distance Aquabike: Swim 1.2 miles, Bike 56 miles
- Team Full or Half: Relay over full or half distances
- 50K Ultra Trail Run: 48 km, +700 m elevation
- 20K Trail Run: 27 km, +400 m elevation
The Half Iron Distance in 2026 is also used to host the British and English Middle Distance Triathlon Championships, with half entries automatically entered into those championships. Visit the organization's website for the most recent information.
