Great Lakes Megalopolis the Chicago-Rochester corridor, starting at the Detroit River but continuing east beyond Lake Ontario along the St. Lawrence Seaway to Quebec City and the Gulf of St. Lawrence. Several corridors have interstate highways but no comprehensive passenger rail service. These highway routes pass through both core and fringe areas of the Great Lakes megalopolis. The upper Great lakes region has a marine corridor that connects Lakes Superior, Huron, and Michigan. However, this route does not include parallel Amtrak passenger rail or interstate highway service. I-70 follows the southern fringe of the megaregion. It runs from Kansas City MO to just
Great Lakes Greyhound Lines Milwaukee (in Wisconsin), and Chicago (in Illinois), as far to the south as Chicago (in Illinois), Dubuque (in Iowa), and Omaha (in Nebraska), and as far to the west as Sweetgrass, Great Falls, Helena, and Butte, Montana; it had met (to the west) the Northwestern GL, (to the north) the Western Canadian GL and the Eastern Canadian GL, (to the east and south) the Great Lakes GL and the (second) Eastern GL (formerly the second Central GL and the Pennsylvania GL), and (to the south) the Overland GL. Thus ended the Great Lakes GL and the Northland GL, and thus