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Iguaçu River
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Iguaçu River Iguaçu Falls
Dusky swifts: Surviving against the odds at Iguaçu Falls
Specialized diet of the snail kite
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water glass on white background. (drink; clear; clean water; liquid)
Water and its Varying Forms
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Iguaçu River
Iguaçu River

Iguaçu River

river, Brazil
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Also known as: Iguassú River, Río Iguazú, Rio Iguaçu
Written and fact-checked by
The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.
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Also spelled:
Iguassú
Portuguese:
Rio Iguaçu
Spanish:
Río Iguazú
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Iguaçu Falls
1 of 3
Iguaçu FallsIguaçu Falls, Brazil.
Dusky swifts: Surviving against the odds at Iguaçu Falls
2 of 3
Dusky swifts: Surviving against the odds at Iguaçu FallsObserve how the rise of waters in the Iguaçu River turns into dramatic waterfalls and how the dusky swifts build their nest behind the falling water.
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Specialized diet of the snail kite
3 of 3
Specialized diet of the snail kiteA snail kite hunting for apple snails along the Iguaçu River in South America.
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Iguaçu River, river that flows through Santa Catarina and Paraná states in southern Brazil and is known chiefly for the spectacular Iguaçu Falls. The Iguaçu River is formed by headstreams rising in the Serra do Mar near Curitiba. It winds generally westward through the uplands for about 820 miles (1,320 km) before joining the Paraná River at the point where Argentina, Brazil, and Paraguay meet. The Iguaçu River forms a small portion of the Brazilian-Argentine border. Sections of the river are navigable. Hydroelectric plants are located on the river at the Segredo, Osorio, and Santiago falls.

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Amy Tikkanen.