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River, northwestern South America. A major tributary of the
Amazon River, it rises in the rainforest of eastern Colombia,
where it is known as the Guainía, and forms a section of the
border between Colombia and Venezuela. It crosses Brazil and
joins the Amazon at Manaus. It is about 1,400 mi (2,250 km) long
and is a major transport artery. Its name comes from its jet-
black colour, which is caused by the decomposition of organic
matter and its low silt content. Variants of NEGRO RIVER Negro
River or Guainía River This entry comes from Encyclopædia
Britannica Concise. For the full entry on Negro River, visit
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