The Great Lakes Region of North America includes eight U.S. states of Illinois, Indiana, Michigan, Minnesota, New York, Ohio, Pennsylvania, and Wisconsin, as well as the Canadian province of Ontario. The region geographically borders the Great Lakes and forms a distinctive historical, economic, and cultural region. The Great Lakes Commission, authorized by the eight American states and Ontario, confirmed by the Canadian and American federal governments recognizes a formal U.S. - Canadian International Great Lakes region
The Great Lakes Basin is the corresponding geological formation within the larger region. The Hudson Bay, the Mississippi-Ohio, and Hudson-Mohawk river systems supplement the Great Lakes' watershed.