The Iguazu River (Portuguese: Rio Iguaçu, Spanish: Río Iguazú) has its source in the Serra do Mar (Mountains by the Sea) in the Brazilian state of Paraná to finish over a thousand kilometers southeast at the Paraná River, in the triple border with Paraguay and Argentina. Just a few kilometres upstream, it surges over the drop of a plateau forming the Iguazu Falls.

See also

• Iguazu Falls
• Iguaçu National Park (Brazil)
• Iguazú National Park (Argentina)