The Iguazu River or Rio Iguassu (; Portuguese: Rio Iguaçu [ˈʁi.u iɡwaˈsu]; Spanish: Río Iguazú [ˈri.o iɣwaˈsu]; from Guarani y guasú 'big water'), is a river in Brazil and Argentina. It is an important tributary of the Paraná River. The Iguazu River is 1,320 kilometres (820 mi) long, with a drainage basin of 62,000 km2 (24,000 mi2).
