Iguazu National Park, Brazil and Argentina This spectacular semicircular waterfall that forms the border of Argentina and Brazil spans almost 300 meters in diameter and up to 80 meters in height. Home to an abundant array of wildlife from neon-winged butterflies to sly caiman, elusive jaguars and more curious coatis, the falls' subtropical rainforest surroundings provide a serene backdrop to its cascading torrents of water.