Courtesy of WOWSA, Huntington Beach, California.

Rio Negro Challenge Amazonia is a 500m, 1.5 km, and 3 km river swim from Iranduba to Manaus in Brazil, partly along the Rio Negro Bridge in the Rio Negro on April 25th.

The Rio Negro is the largest tributary of the Amazon and the largest blackwater river in the world, and one of the world’s ten largest rivers in average discharge. It has its sources along the watershed between the Orinoco and the Amazon basins.

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