Courtesy of WOWSA, Huntington Beach, California.

The largest 10 km marathon swim in Japan is between the island of Enoshima and the main island of Honshu: the Shonan Open Water Swimming in Sagami Bay, Kanagawa Prefecture, Japan.

In 2016, there were a total of 450 entrants in the race: 371 men, 77 women and 2 disabled athletes). 431 people started the race with 79% of the men successfully completing the race and 81% of the women successfully completing the island-mainland race.

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