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
Summit Lakes (Ontario) creek inflow at the northeast tip. The primary outflow is an unnamed creek, from the south end of the south lake, to Upper Twin Lake, which eventually flows via Rabbit Creek, Rabbit Lake, the Matabitchuan River, Lake Timiskaming, and the Ottawa River into the St. Lawrence River. Summit Lakes (Ontario) The Summit Lakes are a pair of lakes connected by a short creek in Nipissing District, Ontario, Canada, about southeast of the community of Temagami. The Ontario Northland Railway mainline crosses the southern tip of the south lake on a trestle. The north lake is about long and wide, and