Southern Ontario is part of the Canadian province of Ontario that is south of the Algonquin Park. It is the farthest south part of Canada.
Over 12 million people live here, more than anywhere else in Canada.
Some cities in Southern Ontario are Toronto, Ottawa, Barrie, Guelph, Hamilton, Kingston, Kitchener, London, St. Catharines, Niagara Falls, Waterloo, and Windsor.