Guinea officially the Republic of Guinea (French: Rpublique de Guine), is a country in West Africa. Formerly known as French Guinea (Guine franaise), it is today sometimes called Guinea-Conakry to distinguish it from its neighbour Guinea-Bissau and the Republic of Equatorial Guinea. It has a population of 10,057,975 and an area of 246,000 square kilometres (94,981 sq mi). Forming a crescent as it curves from its western border on the Atlantic Ocean toward the east and the south, it shares its northern border with Guinea-Bissau, Senegal, and Mali, and its southern border with Sierra Leone, Liberia, and Cte d'Ivoire. The Niger River's source is in the Guinea Highlands in southeastern Guinea. Conakry is Guinea's capital, largest city, and economic centre. Other major cities in the country include Kankan, Nzrkor, Kindia, Labe, Guckdou, Mamou and Boke. Guinea's 10 million people belong to twenty-four ethnic groups.