Abuja is the capital city of Nigeria. It is located in the centre of Nigeria in the Federal Capital Territory (FCT). Abuja is a "planned" city, as it was mainly built in the 1980s and officially became Nigeria's capital on 12 December 1991, replacing the role of the previous capital Lagos.
Abuja's geography is defined by Aso Rock, a 400-metre monolith left by water erosion. The Presidential Complex, National Assembly, Supreme Court and much of the town extend to the south of the rock. "Aso" means "victorious" in the language of the (now displaced) Asokoro ("the people of victory").
Other sights include the Nigerian National Mosque and the Nigerian National Christian Centre. The city is served by the Nnamdi Azikiwe International Airport, while Zuma Rock lies nearby. Abuja is known for being the best purpose-built city in Africa as well as being one of the wealthiest and most expensive.