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The 13km Thames Marathon is a true test of grit and endurance, offering swimmers the rare chance to conquer one of the longest and most beautiful stretches of the River Thames.
Spanning from Henley-on-Thames to Marlow, this epic point-to-point challenge takes participants through 13km of winding river, past rolling countryside, quaint villages, and historic bridges.
It’s not just the distance that makes this swim special—it’s the journey. The peaceful flow of the river contrasts with the relentless effort required to push through mile after mile. Surrounded by nature and history, swimmers find themselves immersed in the landscape as much as the water itself. With meticulous organization, top-notch safety support, and a camaraderie among participants that fuels determination, the 13km Thames Marathon delivers a spectacular, unforgettable experience for those bold enough to take it on.
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Practical stuff to know Start: Totnes (near Steamer Quay) Finish: Dittisham on the River Dart Age: 18+ Parking: Park at the finish in Dittisham where possible - shuttle boats transfer swimmers up river to the start in Totnes. Limited local parking, so plan ahead Spectators: Best at the finish in Dittisham - it’s lively, welcoming & far easier to access than the start Feeding: There's a couple of floating feed stations on the course with fun, friendly volunteers. Water & refreshments are also available at the finish, which has a festival feel. Wetsuits: Wetsuits are compulsory unless you have pre-approved skin-swimming permission & meet the temperature criteria. For most swimmers, a full-length wetsuit is the safest & most comfortable option for 10km downriver.
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Catch - your digital swim coach - is the Official Training Partner for Great North Swim. Here’s your guide to training, kit, fuelling & race day.
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Test your endurance and take on the ultimate challenge with the Super 6 mile swim in London's Hyde Park! Swim Serpentine offers this incredible race on Saturday, September 20th. Imagine yourself swimming six miles in the iconic lake, pushing your limits and achieving a truly remarkable feat of endurance.
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Ullswater is often described as the most beautiful of the Chillswim swims, & it’s easy to see why. The lake is quieter, wilder & more dramatic than Coniston, with huge mountains rising straight out of the water for much of the route. It’s a favourite among many experienced swimmers, & a brilliant step up if you’ve already done a long lake swim & want something that feels properly special.
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Start with Catch Free.
Get structured swim sessions each week, a monthly technique lesson, watch sync & full community access - free forever.