Courtesy of WOWSA, Huntington Beach, California.
Lynn Arave of the Deseret News wrote an history of open water swimming in the Great Salt Lake in Utah.
Early marathon swims were held in 1919 with races conducted throughout the 1920s and 1930s. Winning times were over two hours so the distance was probably at least 6 km. Unfortunately, the races ended in 1940.
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