Standards and guidelines for undertaking solo open-water marathon swims in any body of water. Globally endorsed.
MSF Documented Swims have been conducted, documented, and authenticated according to the highest standards of integrity.
Recognizing the most outstanding marathon swims of the year, and the people who contribute most selflessly to the sport.
Regional open water swim calendars, curated by locals.
Current calendars: U.S. (6 miles & up), Southern California, Midwest, Mid-Atlantic.
©2015 Marathon Swimmers Federation