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London's marathon of swimming


Marathon Swims


A marathon is the ultimate swimming challenge. Swimming now has its own marathon.

Marathon Swims 2023:

Register your interest to be first to hear about the launch of Marathon Swims 2023 and the Marathon Swims Virtual Challenge 2023.

Marathon Swims format:

We've innovated in swimming to give you instant, reliable results using RFID chip technology to deliver an engaging, exciting challenge event (for spectators as well as participants). No need for lap counting or endless laps of the same lane.


Watch our 30 second Marathon Swims format explainer video:

Checkout out our previous

Marathon Swims events at the London Aquatics Centre:

Find out more about the Marathon Swims event format

For further information - please see our FAQ's

Who will be the next to make it on to the Marathon Swims Hall of Fame?

A big thank you to our Marathon Swims Partners


The Ultimate Swimming Challenge

Marathon Swims 2023

Date: tbc

London Aquatics Centre

London's marathon of swimming will return to the London Aquatics Centre in 2023. Take on the Marathon 10k, Half Marathon 5k or the 1k Challenge. Or team up with a friend to take on the Team 10k.

More information click here.

Register your interest in Marathon Swims 2023 here.

Marathon Swims Virtual Challenge 2023

1-30 November 2023

Any swimming venue

Marathon Swims Virtual Challenge will be back again! Take on the Marathon 10k, Ultra Marathon 25k or the Ultra Marathon 50k over the course of November 2023.

FREE to enter with medals and merchandise available for purchase.

Register your interest



Press and media (including latest press releases)

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Created and operated by Participation Sport Ltd.

Owned by The Swimathon Foundation

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