Southwestern Ontario

Southwestern Ontario
Secondary region
Coordinates: 43°30′N 81°00′W / 43.500°N 81.000°W / 43.500; -81.000
CountryCanada Canada
ProvinceOntario Ontario
Area
 • Total36,797.54 km2 (14,207.61 sq mi)
Population
 (2021)
 • Total2,796,367
 • Density76/km2 (200/sq mi)
Time zoneUTC−5 (EST)
 • Summer (DST)UTC−4 (EDT)
Postal code prefixes
Area code(s)519, 226, 548, 905, 289, 365

Southwestern Ontario (census population 2,796,367 in 2021) is a secondary region of Southern Ontario in the Canadian province of Ontario. It occupies most of the Ontario Peninsula bounded by Lake Huron, including Georgian Bay, to the north and northwest; the St. Clair River, Lake St. Clair, and Detroit River, to the west; and Lake Erie to the south. To the east, on land, Southwestern Ontario is bounded by Central Ontario and the Golden Horseshoe.


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