china beach san francisco

China Beach, San Francisco. Photo by Ryan Willis.

The Marathon Swimmers Federation develops standards and knowledge resources for unassisted-style solo marathon swimming.

  • The LongSwims database is the world’s most comprehensive source of historical marathon swim results.
  • The MSF Documented Swims program authenticates and ratifies independent marathon swims.
  • The Marathon Swimmers Forum offers social networking and peer education to aspiring and experienced marathon swimmers. It is the world’s largest independent online community of open water swimmers.
  • The Global Marathon Swimming Awards annually honors the most outstanding marathon swims and service contributions.
  • The MSF Rules of Marathon Swimming defines swim rules and standards for marathon swims in any body of water.
  • More…

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Our Projects

LongSwims Database

World's most comprehensive swim results database

50,000+ swims by 20,000+ swimmers, 1875 to present.

Documented Swims

Solo swim ratification service

Independent solo marathon swims, documented according to the highest standards.

Rules of Marathon Swimming

Standards for unassisted swims in any body of water

Annual Awards

Recognizing the most outstanding achievements and contributions in marathon swimming


MSF Store

The source for official MSF merchandise

  • Photo Calendars
  • Swim Caps
  • Patches
msf swim cap

GPS Track Database

Interactive visualizations of historical tracking data

400+ marathon swims, 2010 to present.

Live GPS tracking service for marathon swims

Featured Blogs

Independent voices from the open water world

Sea Temperature Map

Real-time sea temps from NOAA and affiliated data buoys


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Stay updated on the latest news & opinions from the world of marathon swimming.


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