The Northumbrian
Always double-check with the organizer's website! This page may contain affiliate links.
The Northumbrian : Events at Kielder Water and Forest
The Northumbrian is a multi-discipline endurance event based at Kielder Waterside in Kielder Forest, Northumberland. The programme includes full and half iron distance triathlons, team relay options, aquabike, and UTMB index trail runs held on lake, road and forest terrain. Entries are limited for individuals and teams.
Distances offered include:
- Full Iron Distance Triathlon: Swim 2.4 miles, Bike 112 miles, Run 26.2 miles
- Half Iron Distance Triathlon: Swim 1.2 miles, Bike 56 miles, Run 13.1 miles
- Team relay options for full and half distances
- 50K Ultra Trail Run: about 48 km with +700 m elevation
- Shorter trail run: about 27 to 28 km with +400 m elevation
The event is the designated venue for the 2026 British and English Middle Distance Triathlon Championships; all half iron distance entries are automatically entered into those championships. Some event categories require age eligibility and British Triathlon membership or a race licence or single use Race Pass.
Individual entries include event apparel for participants, a swim cap for triathletes, electronic chip timing, on-course support and nutrition, a finisher medal and goody bag, and parking. Course material and participant feedback note lake swimming, hilly cycling routes and forest trail running surfaces. Visit the organization's website for the most recent information.
