Nigeria (/naɪˈdʒɪəriə/ (About this soundlisten)), officially the Federal Republic of Nigeria, is a sovereign country in West Africa bordering Niger in the north, Chad in the northeast, Cameroon in the east, and Benin in the west. Its southern coast is on the Gulf of Guinea in the Atlantic Ocean. It is a federal republic comprising 36 states and the Federal Capital Territory, where the capital, Abuja, is located. Lagos is the most populous city in the country and the African continent, as well as one of the largest metropolitan areas in the world.
Abuja (/əˈbuːdʒə/) is the capital and eighth most populous city of Nigeria. Located in the centre of the country within the Federal Capital Territory (FCT), it is a planned city built mainly in the 1980s. It replaced Lagos, the country’s most populous city, as the capital on 12 December 1991.
Abuja’s geography is defined by Aso Rock, a 400-metre (1,300 ft) monolith left by water erosion. The Presidential Complex, National Assembly, Supreme Court and much of the city extend to the south of the rock. Zuma Rock, a 792-metre (2,598 ft) monolith, lies just north of the city on the expressway to Kaduna.