Chaco is an Argentine province located in the north of the country, near the border with Paraguay. Its capital is Resistencia on the Paraná River opposite the city of Corrientes. The second city of the province is Sáenz Peña. The province is bordered by Salta and Santiago del Estero to the west, Formosa to the north and east, Corrientes and the Republic of Paraguay to the southeast and Santa Fe to the south (divided by the 28th parallel south).
From 1950 to 1955, Chaco was named Presidente Perón. The province lies in the Gran Chaco plains, also known as the "Green Hell" for its extreme weather conditions. Frequent droughts make for desert-like parts of the geography. Yet, torrential rains and occasional floods create areas of rainforest habitat.