in sub-Saharan Africa , with a population of over 10 million in its urban area alone. Population of Nigeria's cities over a million include Lagos (7,937,932), Kano (3,848,885), Ibadan (3,078,400), Kaduna (1,652,844), Port Harcourt (1,320,214), Benin City (1,051,600), Maiduguri (1,044,497) and Zaria (1,018,827), however, these figures are regularly disputed in Nigeria. [