Long aquathlons in the UK
The longest aquathlon in the world is a 13km sea swim followed by a 13km trail run so if you feel like taking on a serious feat of stamina without the expense of a bike, read on! Select your location for long distance aquathlons in your area or scroll down to see events coming up.
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Long aquathlons in 2025/2026
Featured events are listed below - select a month/region or the map view to see all events.

- Sat 13 Sep
- £100
York, East Yorkshire, UK
Sundowner 70.3 Aquathlon
Bringing back the Sundowner 70.3 Aquathlon! An unforgettable triathlon event at Allerthorpe Lakeland Park in Yorkshire is now back on the race calendar and 100% going ahead!
- 1900 m lake swimming
- 20 km trail running + 17 ft ascent
Long aquathlons near you
Select your location for long distance aquathlons in your area.