The Uruguay River (Spanish: Rio Uruguay) is a river in South America.
The river flows from North to South and makes boundary with Brazil, Argentina and Uruguay.
It forms, with the Parana River, the River Plate estuary.
The Rio Uruguay is navigable from around Salto Chico .
Its name comes, as it's often the case in America, from the Spanish settlers' interpretation of the word the locals used to designate it. The original name is in Guaraní language and it means "river of the painted birds".
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