Nigeria

Since 12th December 1991, the capital of Nigeria has been Abuja, replacing the country’s most populous city, Lagos, in that role.

An excerpt from the article 19 facts about Nigeria

Abuja is the capital and the eighth-most populous city in Nigeria. It is located in the center of the country, within the Federal Capital Territory. Then the existing capital, Lagos, became overcrowded in 1976, and it was decided to move it to a city located in the central part of the country, Abuja. The city was built from scratch in the 1980s, its central business district designed by Japanese architect Kenzō Tange.

One of the city’s most prominent features is Aso Rock, a 400-meter-high rock monolith with a peak height of 936 meters above sea level. Abuja is one of the few purpose-built capitals in Africa, and one of the richest.

The city is the headquarters of the Economic Community of West African States and the regional headquarters of OPEC.