Thames Marathon
Henley-on-Thames, England, United Kingdom
10 Aug, 2025 (Sun)
Swimming
5.5 km, 9 km, 13 km
About the event
The Thames Marathon is an endurance swim between Henley-on-Thames and Marlow with a choice of 3 distances (13km / 9km / 5.5km) and a 13km 3-person relay option. It covers a beautiful stretch of the Thames and has become one of open water swimming’s most prestigious marathon swims.
The Event Village is in Higginson park in Marlow, where you will find the swim finish, registration, food and drink and merchandise for sale. Swimmers will be transported by coach to the full, mid or half distance start from here, and will swim back to Marlow. There is also the option to walk or run to the start of the half-marathon.
The swims are broken up into sections, as there are several locks where swimmers must exit the river. They will find well-stocked feed stations manned by volunteers at these exits points. The manageable chunks make the swims accessible for many types of swimmer.
The Event Village is in Higginson park in Marlow, where you will find the swim finish, registration, food and drink and merchandise for sale. Swimmers will be transported by coach to the full, mid or half distance start from here, and will swim back to Marlow. There is also the option to walk or run to the start of the half-marathon.
The swims are broken up into sections, as there are several locks where swimmers must exit the river. They will find well-stocked feed stations manned by volunteers at these exits points. The manageable chunks make the swims accessible for many types of swimmer.
Races offered by this event
You have 32 weeks to prepare
13 km swim
10 Aug, 2025 (Sun) - 07:00
Swimming
13 km
Solo
On site
River
Timed
City
Rural
River
Scenic
Fun
9 km swim
10 Aug, 2025 (Sun) - 07:00
Swimming
9 km
Solo
On site
River
Timed
City
Rural
River
Scenic
Fun
5.5 km swim
10 Aug, 2025 (Sun) - 07:00
Swimming
5.5 km
Solo
On site
River
Timed
City
Rural
River
Scenic
Fun
13 km swim relay
10 Aug, 2025 (Sun) - 07:00
Swimming
13 km
Relay (3)
On site
River
Timed
City
Rural
River
Scenic
Fun
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Official links
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