Lawrence Rivers at Montreal, and the Eastern Townships southeast of Montreal. There are, however, several wider areas of flat farmland, including the southwestern Ontario Peninsula between Lake Huron and Lake Erie (which makes up the western third of the corridor), the eastern Ontario delta from Ottawa to the junction of the Ottawa and St. The highways in this part of the corridor often run right on the boundary of the shield, and it is possible to observe the frequent change from limestone to granite in rockcuts along the way.

A drive of only a few minutes north from cities or towns along the eastern two-thirds of the corridor will show an abrupt change from flat farmland and limestone bedrock to the granite hills of the shield. For most of its length, the corridor runs through a narrow strip of farmland with the Canadian Shield to the north and the Appalachian Mountains or the Great Lakes to the south. The corridor extends from Quebec City, Quebec, in the northeast to Windsor, Ontario, in the southwest, running north of the Saint Lawrence River, Lake Ontario and Lake Erie. Most of the Ontario portion of the Corridor is situated immediately north of Lake Erie and Lake Ontario. The Montreal–Windsor portion of the Corridor.

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