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 – Escravos River F Forcados River G Gadar Tamburawa River – Nun River O Ogun River – Gongola River – Escravos River F Forcados River G Gadar Tamburawa River – Kwa Ibo River N New Calabar River – Ogunpa River – Bonny River C Calabar River – Oramiriukwa River – Nun River O Ogun River – Kwa Ibo River N New Calabar River – Ogunpa River – Ogunpa River – Kwa Ibo River N New Calabar River – Nun River O Ogun River – Kaduna River – Nun River O Ogun River – Gongola River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River