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Rio Negro River

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The Rio Negro has this color because of the humus that is carried into the river by the floods. The acidity of its waters is high, with a pH of 3.8 to 4.9 (due to a lot of acids inside it from the decomposition of the plants), so many insects and mosquitoes do not survive in the region.
Being the largest tributary and most large black water river in the world is the second largest in the volume of water, second only to the Amazon River.

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