Ontario Peninsula

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The Ontario Peninsula is the southernmost part of the province of Ontario and of Canada as a whole. It is bounded by Lake Huron to the west, Lake Ontario to the east, and Lake Erie to the south. At its tip, the peninsula is separated from Michigan by the Detroit River, the St. Clair River, and Lake St. Clair. A secondary peninsula, the Niagara Peninsula, projects toward New York on its eastern side and ends at the Niagara River.

The Bruce Peninsula is often considered separate from the Ontario Peninsula due to its colder boreal climate and marine culture.

The corner of the peninsula that lies on Lake Ontario is known as the Golden Horseshoe and forms Canada's largest population centre. Other large cities include London and Windsor.