Nigeria /naɪˈdʒɪəriə/, officially the Federal Republic of Nigeria, is a federal constitutional republic located in West Africa. It shares land borders with the Republic of Benin in the west, Chad and Cameroon in the east, and Niger in the north. Its coast in the south lies on the Gulf of Guinea in the Atlantic Ocean. Nigeria is comprised of 36 states and the Federal Capital Territory, Abuja. Lagos is the largest city and the dominant cultural and commercial center.