When, what, and where?


August 11, 2024

Marathon Swim

Henley-on-Thames to Marlow

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Registration fees:

Half Marathon Approx 5.5km: £100

Mid-Distance Approx 9km: £120

Full Marathon Approx 13km: £137


Minimum sponsorship pledge excluding gift aid:

Half Marathon: £100

Mid-Distance: £150

Full Marathon: £200



About the event


The Thames Marathon is an endurance swim between Henley-on-Thames and Marlow with a choice of 3 distances, half-marathon, mid-distance and full marathon.This event covers a picturesque stretch of the River Thames and has become one of open water swimming’s most prestigious marathon swims.

By taking on a challenge event you’ll help us support over 350 babies, children and young people who are seriously unwell – helping them, and their families, to make the most of every day.

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Our events team is here to support you with every aspect of your challenge.We can talk you through the sign-up process, provide training plans and fundraising materials, and we’ll answer your questions every step of the way. You will also receive a free Noah’s Ark t-shirt!

Any questions?

If you have any questions about this or any other event, email us at tcucchiara@noahsarkhospice.org.uk or call 020 8449 8877.