Courtesy of Pierre Gadelha, Rio Negro, Brazil.

Rio Negro Challenge Amazonia, one of the World’s Top 100 River Swims, is a 1.5 km, 3 km and 30 km marathon swim from Iranduba to Manaus in Brazil, partly along the Rio Negro Bridge in the Rio Negro.

2016 Olympic champion Sharon van Rouwendaal of the Netherlands and two-time Olympian Ana Marcela Cunha of Brazil swam a special 8.5 km match race in December 2018 that will be repeated in December 2019, a nice kickoff to the 2020 Olympic year.

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