Rio Negro, South America
At just over 430 navigable miles, the Rio Negro is the world's largest blackwater river, and forms the border between Colombia and Venezuela. Its color, which looks like darkly brewed tea, is caused by the release of tannins from decaying vegetation. The Rio Negro feeds into the Amazon just below Manaus, Brazil, and is its largest tributary, creating a beautiful contrast of color where the white waters of the Amazon and the black waters of the Rio Negro meet.
At just over 430 navigable miles, the Rio Negro is the world's largest blackwater river, and forms the border between Colombia and Venezuela. Its color, which looks like darkly brewed tea, is caused by the release of tannins from decaying vegetation. The Rio Negro feeds into the Amazon just below Manaus, Brazil, and is its largest tributary, creating a beautiful contrast of color where the white waters of the Amazon and the black waters of the Rio Negro meet.
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