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The Río Negro (, ''Black River'') is a river in southern Brazil and central Uruguay. It rises in the southern highlands of Brazil, just east of Bagé, and flows west across the entire width of Uruguay to the
Uruguay River The Uruguay River ( ; ) is a major river in South America. It flows from north to south and forms parts of the boundaries of Brazil, Argentina and Uruguay, separating some of the Argentine provinces of La Mesopotamia from the other two countr ...
. The course of the Río Negro across Uruguay effectively divides the south and the north of the country. The Río Negro's principal tributaries are Yí River and Tacuarembó River. The river is dammed near Paso de los Toros, creating the Rincón del Bonete Reservoir, also called the Gabriel Terra Reservoir or the Rio Negro Reservoir. With a surface area of about , it is the largest
reservoir A reservoir (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation. Reservoirs are created by controlling a watercourse that drains an existing body of wa ...
in Uruguay and has an installed capacity of 160 MW. Downstream from the Rincón del Bonete Reservoir, there are two more dams, the Baygorria Dam and the Constitución Dam at Palmar,Page about the Constitution Dam at Palmar
which generate hydroelectric power for Uruguay with 108 MW and 333 MW, respectively. The Río Negro's
drainage basin A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, ...
size is about . There is a delta at its confluence with the Uruguay River with two main mouths. Yaguarí creek -bordered by Vizcaino and Lobos Islands- is the navigable entry to Negro River, and may change water flow direction when the Uruguay is high while the southern mouth (Spanish: Boca Falsa) is very wide but shallow.


See also

* Lago Rincón del Bonete * 1959 flood in Uruguay


References


External links

* Rivers of Uruguay Rivers of Brazil Tributaries of the Uruguay River Rivers of Rio Grande do Sul Rivers of Cerro Largo Department Rivers of Rivera Department Rivers of Tacuarembó Department Rivers of Durazno Department Rivers of Río Negro Department Rivers of Flores Department Rivers of Soriano Department Brazil–Uruguay border {{Uruguay-river-stub