Location: Iguazu Falls - Brazil Formed: Waterfalls form when a river erodes soft rock more quickly than hard rock and this may lead to the creation of a waterfall. The soft rock erodes more quickly, undercutting the hard rock.
Iguazu Falls, Brazil are waterfalls of the Iguazu River on the border of the Brazilian state of Paraná and the Argentine province of Misiones. The falls divide the river into the upper and lower Iguazu. One of the 7 natural wonders of the world