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The Amazon River in South America is the second longest river in the world and by far the largest by waterflow with an average discharge greater than the next seven largest rivers combined (not including Madeira and Rio Negro, which are tributaries of the Amazon). The Amazon, which has the largest drainage basin in the world, about 7,050,000 square kilometres (2,720,000 sq mi), accounts for approximately one-fifth of the world's total river flow.
"Meeting of the Waters" is the point at which the Rio Negro meets the Rio Solimões in the Brazilian state of Amazonas - Manaus City. Due to differences in temperature, speed and density, the two rivers' differently colored waters don't mix immediately, but flow side by side for several miles.