Marathon Swims

A marathon swim is a nonstop, unassisted open water swim of 10 kilometers or longer.

Marathon swims take place in oceans, seas, bays, lakes, and rivers throughout the world - as part of organized events, sanctioned solo swims, or self-organized independent solo swims.

MSF Documented Swims

For publishing and ratifying documentation of independent marathon swims (not part of an organized race or governed by a local association).

Go to: MSF Documented Swims

LongSwims Database

The world’s most comprehensive repository of solo marathon swim results, listing 63,000+ documented, unassisted swims, 1875 to present.

Go to:

Swim Event Calendars

For a more extensive list of marathon swims, see MSF’s continuously-updated calendars of organized marathon swims:

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Challenges