Senegal, officially the Republic of Senegal, is the westernmost country of mainland West Africa, situated along the Atlantic Ocean coast. It borders Mauritania to the north, Mali to the east, Guinea to the southeast and Guinea-Bissau to the southwest. Senegal nearly surrounds the Gambia, a country occupying a narrow strip 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 capital and largest city of Senegal is Dakar.