Where is Ontario located within Canada?

Ontario is the second-largest province in Canada by area. It is situated on the Canadian mainland, positioned between Hudson Bay and James Bay to the north and the St. Lawrence River–Great Lakes chain to the south.1

Its geographic boundaries are as follows:
* East: The province of Quebec.1
* South: The United States.1
* West: The province of Manitoba.1

The province is divided into two distinct regions: Northern Ontario, which is largely characterized by the Canadian Shield, and the more densely populated Southern Ontario, which features gently rolling plains and lowlands.2