Peperi Guaçu River

river, South America

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July 23, 2026

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The Peperi Guaçu River is a river in South America that forms part of the boundary between Argentina and Brazil. It is a tributary of the Uruguay River, joining it from the north. The river flows through a region of tropical rainforest and is known for its fast-flowing waters and rapids. Historically, the area around the Peperi Guaçu River was a site of frontier conflicts.1

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Río de la Plata
Physiography of the Uruguay basin
…at its juncture with the Peperi Guaçu River, the first sizable tributary to join it from the north. For most of its course, the fast-flowing Peperi Guaçu marks the boundary between the Argentine province of Misiones and Brazil; and after its confluence with the Uruguay, the latter river divides Brazil…
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…at its juncture with the Peperi Guaçu River, the first sizable tributary to join it from the north. For most of its course, the fast-flowing Peperi Guaçu marks the boundary between the Argentine province of Misiones and Brazil; and after its confluence with the Uruguay, the latter river divides Brazil…
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