There are coins of ½, 1, 5, 10, 25, and 50 kobo and 1 naira, and notes of 5, 10, 20, and 50 naira. Nigeria's capital city, Abuja, is located in the center of the country. . The four largest ethnic groups are the Hausa and Fulani, which together account for . Gowon set 1976 as the target date for Nigeria's return to civilian rule.