West Africa, also called Western Africa and the West of Africa, is the westernmost subcontinent of Africa. West Africa has been defined as including the 18 countries Benin, Burkina Faso, the island of Cape Verde, Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Mali, Mauritania, Niger, Nigeria, the island of Saint Helena, Senegal, Sierra Leone, Sao Tome and Principe and Togo.