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A river of southeast South America rising in southern Brazil and flowing about 1,595 km (990 mi) west and south along the Brazil-Argentina border and the Argentina-Uruguay border to the Río de la Plata.
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|Noun||1.||Uruguay River - a South American river that arises in southern Brazil and flows south to the Rio de la Plata; the northern section forms the boundary between Argentina and Brazil and the southern section forms the boundary between Argentina and Uruguay|
South America - a continent in the western hemisphere connected to North America by the Isthmus of Panama