Argentina, officially the Argentine Republic (Spanish: República Argentina, Spanish pronunciation: [re̞ˈpuβ̞lika aɾxẽ̞nˈtina]), is a country in South America, constituted as a federation of 23 provinces and an autonomous city. It is the second largest country in South America by land area, and eighth in the world. Its continental area is 2,766,890 km² (1,068,302 sq mi), between the Andes mountain range in the west and the southern Atlantic Ocean in the east and south. Argentina borders Paraguay and Bolivia to the north, Brazil and Uruguay to the northeast, and Chile to the west and south. Argentina also claimed 969,464 km² (374,312 sq mi) of Antarctica, known as Argentine Antarctica, overlapping other claims made by Chile (Chilean Antarctic Territory) and the United Kingdom (British Antarctic Territory); all such claims have been suspended by the Antarctic Treaty of 1961. Argentina has the highest Human Development Index level and the second highest Gross Domestic Product (GDP) per capita in purchasing power parity in Latin America. Argentina's nominal GDP is the 31st largest in the world; but when purchasing power is taken into account, its total GDP makes it the 23rd largest economy in the world. The country is currently classified as an Upper-Middle Income Country or as a secondary emerging market by the World Bank. Argentina is about 3,900 km (about 2,500 mi) long from north to south, and 1,400 km (about 870 mi) from east to west (maximum values). It can roughly be divided into four parts: the fertile plains of the Pampas in the center of the country, the source of Argentina's agricultural wealth; the flat to rolling, oil-rich plateau of Patagonia in the southern half down to Tierra del Fuego; the subtropical flats of the Gran Chaco in the north, and the rugged Andes mountain range along the western border with Chile. The highest point above sea level in Argentina is located in Mendoza. Cerro Aconcagua, at 6,962 meters (22,834 feet), is the highest mountain in the Americas, the Southern, and Western Hemisphere.