from Wikipedia Ibadan:
Ibadan (Ìlú Èbá-Ọdàn, the town at the junction the savannah and the forest), the capital of Oyo State, is the third largest city in Nigeria by population (after Lagos and Kano), and the largest in geographical area. At independence, Ibadan was the largest and the most populous city in Nigeria and the third in Africa after Cairo and Johannesburg. It is located in south-western Nigeria, 78 miles inland from Lagos and is a prominent transit point between the coastal region and the areas to the north. Its population is 2,550,593 according to 2006 census results, including 11 local government areas. The population of central Ibadan, including five LGA:s, is 1 338 659 according to census results for 2006, covering an area of 128 km². Ibadan had been the centre of administration of the old Western Region, Nigeria since the days of the British colonial rule, and parts of the city's ancient protective walls still stand to this day. The principal inhabitants of the city are the Yoruba people.