Iguazu River (Portuguese: Rio Iguaçu Portuguese: [ˈʁi.u iɡwaˈsu], Spanish: Río Iguazú Spanish: [ˈri.o iɣwaˈsu]), also called Rio Iguassu, is a river in Brazil and Argentina. It is an important tributary of the Paraná River. The Iguazu River is long, with a drainage basin of . Course The Iguazu originates in the Serra do Mar coastal mountains of the Brazilian state of Paraná and close to Curitiba. For , to its confluence with the San Antonio River, the Iguazu flows west through Paraná State, Br…