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What is the Northumbrian and its Founders
Just waiting to be conquered

A full and half iron-distance triathlon in and around the stunning and challenging Kielder Water and Forest

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 2024 will welcome the third edition of an event which combines scenery, fortitude, adventure, and achievement. Everything it takes to be recognised as a NORTHUMBRIAN.

  • 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

There can be few greater tests of endurance and resilience and no greater sense of pride and achievement, in completing such a challenge.Can you conquer THE NORTHUMBRIAN?
The team behind the Northumbrian

Steve Cram CBE


Steve founded the Kielder Marathon back in 2011 and has spent many years exploring the beautiful surroundings in this hidden part of Northumberland, and has been dreaming up this epic challenge since the very first marathon. Olympian and former 1500m, Mile and 2000m world record holder. One of the UK’s most well known sporting individuals, with a career in what was the golden age of British middle distance running. Steve has a wealth of experience and knowledge, and is now Chief Athletics Commentator at the BBC, as well as coach to commonwealth silver medalist Laura Weightman.

Marcus Cram

Route Design

The Northumbrian is a family adventure for its organisers. Marcus, son of Steve, is a well known competitive cyclist in the North East. Racing for Blaydon CC up to National Level on the road and Hill Climbs, he is no stranger to the epic climbs and beautiful rolling scenery to be found around Kielder. Marcus completed Nice Ironman back in 2017 in an impressive 11 hours 3 minutes, and has been itching to organise this event ever since. The bike routes are fully designed and tested by Marcus...we challenge you to seek out his impressive KOMs on the course!