Used to corroborate: neighbours; largest state by area; Minna, Bida, Kontagora, Suleja; Kainji Lake and National Park; Kainji, Jebba and Shiroro dams; peoples; Nupe Kingdom, Gbagyi states, Sokoto Caliphate; North-Western State 1967; 1976; Borgu from Kwara in the 1990s.