Deca UK

Are these the 7 hardest triathlons in the world?

It's time to bring out the big guns – the big ultra daddies of all triathlons – but which have we named the toughest triathlon in the world?

Okay, you’ve argued over our toughest iron-distance races in the world, so now it’s time to bring out the even bigger guns. Yes, the toughest triathlons in the world. Full stop.

Free from being restricted by the official 226km distances (well, we’ve thrown in our toughest iron race for good measure), these seven events aren’t for the faint-hearted. There’s a Channel Swim, a 1,800km bike course, and a run in Death Valley, with jellyfish, sharks, Jack Frost and sleep deprivation just a quartet of additional challenges that athletes can face.

How to push yourself beyond your physical limits


Make no mistake, these races are 10 out of 10 tough and some of the most relentless challenges on earth, but here we’ve judged them in comparison to each other to find the toughest triathlon in the world.

In terms of housekeeping, we’ve only included races that people can race annually or bi-annually, so there’s no Italian Triple Deca from 2013 or DIY solo challenges such as Sean Conway’s British Triathlon.

Do you agree? Start the debate in the comments below.


Ambleside, Cumbria

With a bike route on the legendary Fred Whitton cyclosportive route and a run up Scafell Pike and down again,TriathlonX is our toughest iron-distance triathlon in the world.

“The bike is based on the hilly granddaddy of all classic bike rides that happens to be 180km long. So it’s been an obvious long-held dream to have it as the showpiece of an iron-distance race," says Anthony Gerundini, 10th 2016 and 120+ time Iron finisher. So how does this Lake District toughie fare against the ultra trio contenders?


Continue reading our guide to the toughest triathlons in the world (2/7)


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