Back Southwestern ontario CEB Edela-Ontario Estonian انتاریو جنوب باختری Persian Sud-Ouest de l'Ontario French Sudoeste de Ontário Portuguese Юго-Западное Онтарио Russian Southwestern Ontario SIMPLE Југозападни Онтарио Serbian Southwestern Ontario Swedish Південно-Західне Онтаріо Ukrainian
Southwestern Ontario | |
|---|---|
Secondary region | |
 | |
| Coordinates: 43°30′N 81°00′W / 43.500°N 81.000°W | |
| Country |  Canada |
| Province |  Ontario |
| Area | |
• Total | 36,797.54 km2 (14,207.61 sq mi) |
| Population (2021) | |
• Total | 2,796,367 |
| • Density | 76/km2 (200/sq mi) |
| Time zone | UTC−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.