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
Great Lakes Airlines (Canada) 440 propliners and Convair 580 turboprops, were older and subject to vibrations during take-off, resulting in passengers nicknaming the company "Great Shakes". Convair 580 turboprops operated by Air Ontario prompted the nickname "Scare Ontario". Great Lakes Airlines was serving the following destinations in Ontario province in Canada with scheduled passenger flights operated with Convair aircraft in 1979: Great Lakes Airlines (Canada) Great Lakes Airlines was a regional airline in Canada. It was formed in 1958 in Sarnia, Ontario by John Blunt and by 1983 became Air Ontario Ltd. In June 1987 Air Ontario Ltd. merged with Austin Airways to form