Foz do Iguaçu (Brazilian Portuguese pronunciation: [ˈfɔz du iɡwaˈsu]; "Iguazu River mouth"), colloquially referred to as Foz, is the Brazilian city on the border of Iguaçu Falls. Foz in Portuguese means the mouth or end of a river and Iguaçu in Guarani or Tupi comes from the words "y" [ɨ], meaning "water" or "river", and "guasu" [waˈsu], meaning "big".
The city is the 7th largest in the state of Paraná with a population of approximately 258,000 inhabitants. It is approximately 650 km (400 mi) west of the capital of the state, Curitiba, being the westernmost city in that State.