Great Lakes form a single, naturally interconnected body of fresh water, within the Great Lakes Basin. They form a chain connecting the east-central interior of North America to the Atlantic Ocean. From the interior to the outlet at the Saint Lawrence River, water flows from Superior to Huron and Michigan, southward to Erie, and finally northward to Lake Ontario. The lakes drain a large watershed via many rivers, and are studded with approximately 35,000 islands. There are also several thousand smaller lakes, often called "inland lakes," within the basin. The surface area of the five primary lakes combined is roughly equal to
Four Mile Lake (Ontario) Four Mile Lake (Ontario) Four Mile Lake is a lake in the city of Kawartha Lakes in Central Ontario, Canada. The lake is northeast of Coboconk, Ontario and west of Burnt River. It is one of the Kawartha Lakes series of lakes and is in the Great Lakes Basin. Four Mile Lake is a relatively shallow warm water lake with a surface area of . The lake is located in the sub watershed of Corben Creek and has a flushing rate of approximately five years. The lake is located on the boundary between two different geological land forms. The northern