Why the two names? Iguazu Falls span the Iguazu River, which is also the border between Argentina and Brazil. Cataratas (waterfalls) del Iguazú is the Spanish name used in Argentina, while Cataratas do Iguaçu is the Portuguese name used in Brazil. In English, they are generally referred to as Iguazu Falls (or Iguazú Falls). In... Continue Reading →