The Iguazu Falls, Iguazú Falls, Iguassu Falls, or Iguaçu Falls (Spanish: "Cataratas del Iguazú" ] ; Guarani: "Chororo Yguasu" ] ; Portuguese: "Cataratas do Iguaçu" ] ) are waterfalls of the Iguazu River on the border of the Argentine province of Misiones and the Brazilian state of Paraná.
 They are the largest waterfalls 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 Governor Bento Munhoz da Rocha Netto Hydroelectric Plant, formerly known as Foz do Areia, is dam and hydroelectric power plant on the Iguazu River near Foz do Areia in Paraná, Brazil.
 It is the furthest dam upstream of the Iguazu Falls and was constructed between 1976 and 1980.
 The power station has a 1676 MW capacity and is supplied with water by a concrete face rock-fill embankment dam.
The Salto Santiago Hydroelectric Power Plant is a dam and hydroelectric power plant on the Iguazu River near Santiago in Paraná, Brazil.
 It is the third dam upstream of the Iguazu Falls and was completed in 1979.
 The power station has a 1,420 MW capacity and is supplied with water by a rock-fill embankment dam.
The Governor José Richa Hydroelectric Plant, formerly known as Salto Caxias, is a dam and hydroelectric power plant on the Iguazu River near Caxias in Paraná, Brazil.
 It is the first dam upstream of the Iguazu Falls and was constructed between 1995 and 1999.
 The power station has a 1240 MW capacity and is supplied with water by a roller-compacted concrete gravity dam.
Rachias timbo is a mygalomorph spider of Argentina, named after its type locality: El Timbó, Iguazú, Misiones.
 "R. timbo" differs from Brazilian "Rachias" species (with similar genitalia) by being smaller and having lower keels on the male embolus.
The Governor Ney Braga de Barros Hydroelectric Plant, formerly known as Segredo, is a dam and hydroelectric power plant on the Iguazu River near Segredo in Paraná, Brazil.
 It is the fourth dam upstream of the Iguazu Falls and was constructed between 1987 and 1991 while being inaugurated in 1992.
 The power station has a 1260 MW capacity and is supplied with water by a concrete face rock-fill embankment dam.
The Isla de San Martín (English: Island of San Martín ) is an island located in Argentina's Iguazu River, within the Iguazu Falls in Misiones Province.
 The island spans the 3 levels that form the falls, but only the lower and middle levels are open to visitors.
 The island can only be reached in small boats, unless the river is below the minimum level.
 Once on the island, one must climb 190 steps through three different pathways that lead to a balcony with panoramic views.
The Sheraton Iguazu Resort is a five star establishment overlooking the landmark Iguazu Falls, in Misiones Province, Argentina.
Puerto Libertad is a village and municipality in Misiones Province in north-eastern Argentina.
 It is located in the Iguazu Department, 25 km south of Iguazu Falls and 5 km from the Paraná River.
 It has a population of 6,143 inhabitants (Census 2001).
The Salto Osório Hydroelectric Power Plant is a dam and hydroelectric power plant on the Iguazu River near Osório in Paraná, Brazil.
 It is the second dam upstream of the Iguazu Falls and was completed in 1979.
 The power station has a 1,078 MW capacity and is supplied with water by a rock-fill embankment dam.

Question: What country do both the Rachias timbo and Iguazu Falls have in common?
Answer: Argentina