Iguazú Falls are waterfalls of the Iguazu River on the border of Argentina and Brazil. Together, they make up the largest waterfall system in the world. and they are truly breathtaking. 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.
Falls between two countries
The falls form the boundary / border area between Argentina and Brazil. Access to the falls is possible from both countries and it is definitely worth visiting from both sides as the prospective from each country is totally different and unique. Also the border crossing located near the falls between these two countries is less restrictive becuase of the sheer number of tourists visiting both sides of this amazing place.