Argentina, officially the Argentine Republic (Spanish: República Argentina), is a country in South America, constituted as a federation of 23 provinces and an autonomous city, Buenos Aires. It is the second largest country in South America and eighth in the world by land area and the largest among Spanish-speaking nations, though Mexico, Colombia and Spain are more populous. 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 claims 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.