The Ultimate Swimming Challenge

London's marathon of swimming


Marathon Swims


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

Marathon Swims 2021:

Date: tbc

London's marathon of swimming will be back for Marathon Swims 2021 at the London Aquatics Centre, on Queen Elizabeth Olympic Park. Event dates to be announced soon. Be first to hear about the launch of Marathon Swims 2021 by registering your interest.


Register your interest in Marathon Swims 2021 - London's marathon of swimming today.

Marathon Swims Virtual Challenge 2021:

Date: 1-30 November 2021


The Marathon Swims Virtual Challenge is your chance to take on an iconic marathon swimming distance in your own time.  Participants chose to take on the Marathon 10k or the Ultra Marathon 25k, swimming as often as you like, at a venue/pool of their choosing to achieve their distance challenge. 


The Marathon Swims Virtual Challenge will be back next year. Register your interest today.

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 2021

Date tbc

London's marathon of swimming returns to the London Aquatics Centre in 2021 (date tbc). Take on the Marathon 10k, Half Marathon 5k or the 1k Challenge. Or team up with a friend to take on the Team 10k.

This sell-out event has been hosted at the LAC since 2017.


 Register your interest here.

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Marathon Swims Virtual Challenge

1 - 30 Nov  2021

Launching soon. Choose from the Marathon 10k or the Ultra Marathon 25k. Swim as often as you'd like in a pool/venue of your choice to achieve your distance challenge over 30  days.


Register your interest here.



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Created and operated by Participation Sport Ltd.

Owned by The Swimathon Foundation

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