Uruguay River

Uruguay River

geographical name

River, southeastern South America. Rising in southern Brazil, it forms the border between Argentina and Brazil and between Argentina and Uraguay. Above Buenos Aires, it combines with the Paraná River to form the great estuary of the Río de la Plata. Its 990-mi (1,593-km) course is interrupted by rapids, but it is navigable by ocean vessels for about 130 mi (210 km) upriver from its mouth.

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