THE ULTIMATE ENDURANCE EVENT
Find out more and enter at thenorthumbrian.com
The ultimate endurance test will be open to a limited number of individuals and teams to conquer the beautiful waters, forests and terrain that give Northumberland and Kielder its unique character. The summer of 2022 welcomed the first edition of an event combining scenery, fortitude, adventure, and achievement. Everything it takes to be recognised as a NORTHUMBRIAN. Back for its fourth edition on 29th June 2025 with BRAND NEW EVENTS.
A full and half-distance iron distance triathlon in and around the stunning and challenging Kielder Water and Forest.
-
SWIM
2.4/1.2 miles in the breath-taking serenity of the famous Kielder Water
-
BIKE
112/56 miles through the stunning valley and a raid over the Border to conquer the challenging, inspiring roads
-
RUN
26.2/13.1 miles along the infamous Forest trails that host the testing Kielder Marathon
ADDED FOR 2025:
-
50K Ultra Trail Run
- 48km run with +700m elevation
-
20K Trail Run
- 27km run with +400m elevation
Included in your entry fee:
- The Northumbrian Cycling Jersey / Running T-shirt (individual entries only)
- Swim Cap (triathlon only)
- Electronic Chip Timing
- On Course Support
- On Course Nutrition
- Medal and Finisher’s Goody bag
- Parking
