Negro River (Amazon) ||This article includes a list of
references, but its sources remain unclear because it has
insufficient inline citations. (January 2010)| Sunset over the
Rio Negro, a couple of kilometers upstream from Manaus
|Countries||Colombia, Venezuela, Brazil| |- left||Branco River|
|- right||Vaupés River| |- location||Department of Guainía,
Amazon Region of Colombia, Colombia| |- location||Manaus,
Amazonas State, Brazil| |Length||2,230 km (1,390 mi) approx.|
|Basin||691,000 km2 (267,000 sq mi)| |- average||28,000 m3/s
(988,800 cu ft/s) | Negro River (Portuguese: Rio Negro, Spanish:
Río Negro, English: Black River) is the largest left tributary
of the Amazon, the largest blackwater river in the world, and
one of the world's ten largest rivers in average discharge. It
has its sources along the watershed between the Orinoco and the
Amazon basins, and also connects with the Orinoco by way of the
Casiquiare canal in southern Venezuela. In Colombia, where the
Rio Negro's sources are located, it is calle