Iguassu Falls is not a city, but rather a natural wonder located on the border of Brazil and Argentina. The name "Iguassu Falls" refers to a series of waterfalls on the Iguazu River. On the Brazilian side, it is known as "Foz do Iguaçu," which is a city located in the state of Paraná. The city of Foz do Iguaçu serves as a gateway to the falls, providing various accommodations and tourist infrastructure. On the Argentine side, the falls are located within the Iguazú National Park near the town of Puerto Iguazú. Overall, Iguassu Falls is a popular tourist destination due to its breathtaking beauty and natural splendor.