Ready to conquer one of Australia's most formidable open-water challenges? The Derwent River Big Swim is a 34km ultra-marathon that will test your limits and reward you with an unparalleled sense of achievement. Beginning at the New Norfolk Bridge and culminating at the iconic Tasman Bridge in Hobart, this swim is a true journey through Tasmania's heartland.

Known for its demanding and unpredictable conditions—from fresh to salt water, and varying currents—the Derwent Big Swim is not for the faint of heart. It is a solo, "bather-only" event that demands meticulous training and mental fortitude. You can see the swim course here

As a leg of the prestigious Australian Triple Crown of Marathon Swimming, its completion places you among an elite group of endurance athletes. Are you ready to make history?

Bit of history: On January 25, 1973 with the time of 10 hours 54 minutes Dez Renford became the first person to successfully complete the swim. Please follow the links bellow to learn more about the History of DRBS and to see The Honour Roll 

A 6-hour qualifying swim (solo or a known event) needs to be completed before attempting the Derwent River Big Swim. Proof of qualifying swim is required upon request.

Usual swimming season on Derwent is between December and April. Remember, you don’t need to follow “the norms” - if you are keen to swim in July, we sure can make that happen.

With “Iswimhappy” you can book your exact slot up to the end of the year 2030. This swim is in the high demand and available slots are limited. Let’s plan in advance…