The lakes district between Knysna and Wilderness on the Garden Route is made up of a series of lakes, most of them visible from the N2 itself. Out of all those lakes, Groenvlei - just east of Sedgefield - is the only one that is a fresh water lake and without an inlet or an outlet. The lake is maintained by rainwater and springs alone. There are very strict restrictions on boating on Groenvlei with only electric motors, and no outboard motors, allowed. The lake contains largemouth bass and is one of only a few lakes in the country that has them occur there naturally.