Nigeria

Exact population: 131,859,731 note: estimates for this country explicitly take into account the effects of excess mortality due to AIDS; this can result in lower life expectancy, higher infant mortality and death rates, lower population and growth rates, and changes in the distribution of population by age and sex than would otherwise be expected (July 2006 est.)
Literacy: Total population: 68%; male: 75.7%; female: 60.6%
Ethnicities: Nigeria, Africa's most populous country, is composed of more than 250 ethnic groups; the following are the most populous and politically influential: Hausa and Fulani 29%, Yoruba 21%, Igbo (Ibo) 18%, Ijaw 10%, Kanuri 4%, Ibibio 3.5%, Tiv 2.5%
Land boundaries: Total: 4,047 km; border countries: Benin 773 km, Cameroon 1,690 km, Chad 87 km, Niger 1,497 km
Terrain: Southern lowlands merge into central hills and plateaus; mountains in southeast, plains in north
Extremes: Lowest point: Atlantic Ocean 0 m; highest point: Chappal Waddi 2,419 m
Imports: China 9.4%, US 8.4%, UK 7.8%, Netherlands 5.9%, France 5.4%, Germany 4.8%, Italy 4% (2004)
Exports: US 47.4%, Brazil 10.7%, Spain 7.1% (2004)
Industries: Crude oil, coal, tin, columbite, palm oil, peanuts, cotton, rubber, wood, hides and skins, textiles, cement and other construction materials, food products, footwear, chemicals, fertilizer, printing, ceramics, steel, small commercial ship construction and repair

Source: CIA World Factbook