Thames Marathon 2019

Sunday 4th August 2019

A future version of this event is now available here Thames Marathon 2024 on Sun 11 Aug 2024
Event Details


The Thames Marathon is a 14km endurance swim from Henley-on-Thames to Marlow. It covers a beautiful stretch of the Thames and has become one of open water swimming's most prestigious marathon swims. 

The swim is split into 4 sections. Swimmers will be required to exit the water at the 3 locks (Hambledon at 4km, Hurley at 10km and Temple at 11.8km) where drinks and energy snacks will be available.

Wetsuit places - to apply for a wetsuit place click Enter on the Wetsuit Category below. You will be asked to select your wave, please do so based on the following criteria:

We will be setting off small waves at intervals of around 5 minutes starting at 7:00 am.

  • Waves 1, 2, 3 & 3B - these waves are ideal for swimmers who are seeking a faster time and who expect to complete the course in under 4 hours (approximately equivalent to a sub 27 minute mile pace). If you expect your time to be under 3½ hours, please select wave 1, between 3½ and 4 hours select wave 2, 3 or 3B.
  • Waves 4, 5, 6, 7, 8 & 9 - these waves will be mixed ability waves. If you do not consider yourself a racing swimmer, please select one of waves 4 to 9 

If you wish to swim with a friend or as part of a group, please make sure that you all select the same wave.

There will be a cut-off time of six and a half hours, where all swimmers will need to be out of the river. If you anticipate that you will take longer than this, please contact before entering.

Non-wetsuit places - there are a limited number of places open to non-wetsuit swimmers, subject to experience and ability. This is to minimise the risk to our safety plan. Wetsuits are important for retaining heat and providing buoyancy. If you would like a non-wetsuit place your application will be assessed by the events team for approval. We advise swimmers to be prepared to wear a wetsuit if asked, on the day.

All places for the 2019 Thames Marathon have now been offered, and we are operating a waiting list for both wetsuit and non-wetsuit places.

To add yourself to the waiting list for a non-wetsuit place, please complete the application, with details of your NON-WETSUIT EXPERIENCE. You will also be asked to select a wave using the criteria above. if a place becomes available, we will offer it to the person at the top of the list, and they will have 72 hours to accept the place.

Tow Floats will be compulsory for all swimmers, both wetsuit and non-wetsuit. There is an opportunity to buy a tow float during the registration process.

Entry Options - Age 18 & over on Sun 04 Aug 2019
Entries closed
There are no options available at this time please check back later

Sun 04 Aug 2019 at 07:00
Contact Info
Henley Swim
01491 577922
Ask a Question?
Post Code : RG9 2LP