Burkina Faso (UK: /bɜːrˌkiːnə ˈfæsoʊ/, US: /- ˈfɑːsoʊ/ (About this soundlisten); French: [buʁkina faso]), officially the People's Republic of Burkina Faso, is a landlocked country in West Africa. It covers an area of around 274,200 square kilometres (105,900 sq mi) and is surrounded by six countries: Mali to the north and west; Niger to the east; Benin to the southeast; Togo to the southeast; Ghana to the south; and Ivory Coast to the southwest. The July 2019 population estimate by the United Nations was 20,321,378. The country's official language of government and business is French. Roughly 50% of the population speaks the Mossi language natively. Formerly called the Republic of Upper Volta (1958–1984), the country was renamed "Burkina Faso" on 4 August 1984 by erstwhile President Thomas Sankara. Its citizens are known as Burkinabé (/bɜːrˈkiːnəbeɪ/ bur-KEE-nə-bay). Its capital is Ouagadougou.