The Sundays River is the Eastern boundary of the Nelson Mandela Bay metropolitan area and situated right next to the Addo Elephant national Park's southern boundary. The Khoisan people originally named this river Nukakamma (Grassy Water) because the river's banks are always green and grassy despite the arid terrain that it runs through.
The source of the 250 kilometre long Sundays River is in the Compassberg Mountains near Nieu-Bethesda. The river then flows in a general south-south-easterly direction, passing the town Graaff-Reinet in the Karoo before winding its way through the Zuurberg Mountains and then past Kirkwood and Addo in the fertile Sundays River Valley. It empties into the Indian Ocean at Algoa Bay after running through the village of Colchester, 40km east of the city of Port Elizabeth.