The largest city in Nigeria is Lagos. This port city, which is located on the country's southeastern coast, has an official population of 10.2 million in its administrative area.
The New York Times, however, estimates that Lagos had a population of as many as 21 million in 2012, making it the largest city in Africa. Population numbers for Lagos are inherently difficult to assess because two-thirds of its inhabitants live in slums. Many of the people in Lagos' swelling population are relative newcomers who come to the city from rural and economically damaged parts of Nigeria and other parts of Africa looking for opportunities in the city. This influx of arrivals has made Lagos one of the fastest-growing large cities on Earth.