The Iguazu Falls, Iguazú Falls, Iguassu Falls, or Iguaçu Falls are waterfalls of the Iguazu River on the border of the Argentine province of Misiones and the Brazilian state of Paraná. Together, they make up the largest waterfall system in the world. The falls divide the river into the upper and lower Iguazu. The Iguazu River rises near the city of Curitiba. For most of its course, the river flows through Brazil; however, most of the falls are on the Argentine side. Below its confluence with the San Antonio River, the Iguazu River forms the boundary between Argentina and Brazil.
The Iguaçu Falls are an awesome sight as tonnes of water throw themselves over cliffs and the mist rises amongst the jungle. They are taller than Niagara Falls, and twice as wide, for which Eleanor Roosevelt is said to have exclaimed on her first sight of the Falls: "Poor Niagara!". It is well worth spending a day on each side of the falls, especially if you plan to do any of the boat rides or other activities offered. Don't just rush past the main viewpoints and leave. It's important to get a good perspective on the park overall to appreciate this awesome sight. Whilst the majority of the falls are in Argentina, a better overview is had from the Brazilian side.