Ontario is located between the border to the U.S.A., most of the border are the Great Lakes, and Hudson Bay and James Bay to the north. If you want to cross Canada in esat-west direction, its necessary to drive through Ontario, there is no other land connection. It is the most populous province and the second largest. It has the countries capital Ottawa and the provincial capital Toronto is the most populous city of Canada.

The region has numerous mines in the middle and a lot of caves along the southern border. The central and northern part are the Canadian Shield, an old Craton with old crystalline and metamorphic rocks, and numerous mineral resources. The southern part has the limestones of the Niagara escarpment.