Ultra swimruns in the UK
Often encompassing more than 75K and even spanning over two days, ultra-distance swimruns can be a proper endurance challenge. Originating with the ÖtillÖ (Swedish for "island-to-island") Series, this event type now appears on the coast, along rivers and around lochs. Select your location for ultra swimruns in your area or scroll down to see events coming up.
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Ultra swimruns in 2025/2026
Featured events are listed below - select your region to see all events.

- Sat 5 Jul
- £160-£300
Rat Race | Man Vs Coast
Man vs Coast is a 25-mile adventure run in Cornwall featuring natural obstacle challenges such as sea wades and coasteering for the adventurer who wants to make a weekend of it.
- 25 miles trail running