The Province of Chaco (Spanish: provincia del Chaco, Spanish pronunciation: [ˈtʃako]) is a province in north-eastern Argentina. It is bordered by Salta and Santiago del Estero to the west, Formosa to the north, Corrientes to the east, and Santa Fe to the south. It also has an international border with the Paraguayan Department of Ñeembucú. The capital, and largest city, is Resistencia. With an area of 99,633 km2 (38,469 sq mi), and a population of 1,055,259 as of 2010, it is the twelfth most extensive, and the ninth most populated, of the twenty-three Argentine provinces.