Río Negro (Uruguay)
The Río Negro (Spanish for "Black River") is the most important river in Uruguay. It originates in the southern highlands of Brazil, just east of Bagé, and flows west across the entire width of Uruguay to the Uruguay River. The course of the Río Negro across Uruguay effectively divides the south of the country from the north. The Río Negro's principal tributary and the country's second most important river is the Yí 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 4,000 square miles (10,000 km2), it is the largest reservoir in South America.
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