The Rio Negro 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 called the Guainía River. Its main affluent is the Vaupés, which disputes with the headwaters of the Guaviare branch of the Orinoco, the drainage of the eastern slope of the Andes of Colombia. The Rio Negro flows into the Rio Solimões to form the Amazon River South of Manaus, Brazil. Rio Negro is navigable for 700 kilometres from its mouth in 1 metre of water in the dry season, but it has many sandbanks and minor difficulties. A small portion of it forms the international boundary between Colombia and Venezuela. In the wet season, it floods the country far and wide, sometimes to a width of 30 kilometres, for long distances, and for 650 kilometres upstream.
The Nuttall Encyclopedia
1, One of the larger tributaries of the Amazon, rises as the Guainia in SE. Columbia; crosses Venezuela and Brazil in a more or less SE. direction, and joins the Amazon (the Marañon here) near Manaos after a course of 1350 m.; some of its tributaries connect the Orinoco with the Amazon. 2, Has its source in a small lake in the Chilian Andes, flows NE. and E. to the Atlantic, is some 500 m. long, and easily navigated.
The numerical value of rio negro in Chaldean Numerology is: 5
The numerical value of rio negro in Pythagorean Numerology is: 2
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