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The one you won't forget 2024 Results ENTER 2025 This is the ULTIMATE Triathlon 29th June 2025 s
Full Iron Distance
Half Iron Distance
Team Full & Half Iron Distance
About The Northumbrian
Kielder Water and Forest Park

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 2025 will welcome the fourth edition of an event which combines scenery, fortitude, adventure, and achievement. Everything it takes to be recognised as a NORTHUMBRIAN.

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The UltimateEndurance Challenge
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