The Republic of Senegal is the westernmost country in West Africa, situated on the Atlantic Ocean coastline. It borders Mauritania to the north, Mali to the east, Guinea to the southeast and Guinea-Bissau to the southwest. Senegal nearly surrounds Gambia, a country occupying a narrow sliver of land along the banks of the Gambia River, which separates Senegal’s southern region of Casamance from the rest of the country. It also shares a maritime border with Cape Verde. The city of Dakar is the capital; French is the official language; the Western African Franc is the national currency.