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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 Britannica.com.
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