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The One on the River

The One on The River takes place across the scenic Thames Valley area.

Swim the river, cycle the hilly open roads, or run the flat Thames path – with a mixture of grass, tarmac, and trail – taking in the views of Marlow and the surrounding areas.


Join the Triathlon for the ultimate challenge, or either of our Duathlon/Aquabike categories if you prefer to focus on specific disciplines.

If you only fancy a dip in the Thames, then pick one of our swim-only categories instead and get yourself wet!

With multiple distances for each discipline, you’ll find something to challenge yourself this year.



28th May, 2023
Higginson Park, Marlow


Standard - Sprint - Super Sprint


Standard - Sprint - Super Sprint


1500m - 750m - 400m


9th July, 2023

Higginson Park, Marlow


Middle - Standard - Sprint


Middle - Standard - Sprint


3000m - 1500m - 750m

Your entry includes


Finisher Medal


Race Pack


Chip Timing

  • Event location and parking
    The event village and starting point is located at: Higginson Park, High Street, Marlow, SL7 1AW Free event parking will be available within Higginson Park. Access to the car park will be from Lower Pound Lane. Please follow signs from Pound Lane. Please do not park in the local authority Pound Lane car park that services the park and Court Garden Leisure Complex.
  • Event dates and times
    The One on The River has two editions in 2023: Spring Edition is held on May 28th, 2023. Start Times: Summer Edition is held on July 9th, 2023. Start Times:
  • Race pack collection
    Your timing chip, bib number and bike/helmet stickers will be available for collection on the event day. These will be ready for you to collect from Race Enquiries, which will be located between the river and transition. Depending on the event discipline you are competing in, you will be supplied with the following: · timing chip (to be worn on your left ankle); · bib number; · bike and helmet stickers; · swim hat.
  • Race map
    This map shows the full set course of all disciplines. Based on your distance and type you would need to complete particular number of laps. Kindly refer to information below to see laps per distance. Detailed map you can find here: Swim Course: · 400m = ½ lap · 750m = 1 lap · 1500m = 2 laps · 1900m = 2 laps (longer lap) · 3000m = 4 laps Bike Course Run Course: · 5km = 1 lap · 10km = 2 laps · 20km = 4 laps
  • Triathlon distances
  • Duathlon distances
  • Aquabike distances
  • Swimming distances
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