The city known for the "screaming" waterfalls is Iguazu Falls, located on the border between Argentina and Brazil. The falls are part of the Iguazú National Park and represent one of the largest and most stunning waterfall systems globally. The sound and sight of the rushing water create a dramatic effect, earning the falls a spot among the New Seven Wonders of Nature. The surrounding rainforest is rich in biodiversity, making it a popular destination for ecotourism and adventure seekers.