Courtesy of Daniel Vizeu Costa Couto who updates the website of Abilio Couto, an International Marathon Swimming Hall of Fame Honour Swimmer.

The International Marathon Swimming Association (IMSA) is a now defunct professional marathon swimming association that was created to promote and support a global professional marathon swimming circuit. It was succeeded by the World Professional Marathon Swimming Federation (WPMSF) and by the FINA Open Water Swimming Grand Prix pro circuit in 1991.

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