Rules of Marathon Swimming
Overview and Purpose
The Marathon Swimmers Federation (MSF) Rules of Marathon Swimming are a set of standards and guidelines for undertaking a solo, unassisted open-water marathon swim in any body of water.
MSF Rules may be used by any swimmer who wishes to attempt a swim for which there is no local governing body. They also may be used by local governing bodies wishing to adopt a global standard, or as a foundation upon which to establish local exceptions.
MSF Rules do not override local rules; they aim to codify their shared spirit.