lake michigan promontory point

Promontory Point, Chicago. Photo by David Travis.

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

45,000+ swims by 16,000+ 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 the sport of 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

300+ marathon swims, 2010 to present.

Sea Temperature Map

Real-time sea temps from NOAA and affiliated data buoys


Live GPS tracking service for marathon swims

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