Ontario's Major Landform Regions

Ontario's vast territory (1.076M km²) spans four distinct physiographic regions:

1. Canadian Shield (~60% of province)

• Ancient Precambrian bedrock (2.5–4 billion years)
• Glaciated: thin soil, countless lakes (250,000+), boreal forest
• Mineral wealth: gold, nickel, copper, diamonds
• Recreation: canoeing, fishing, hunting, cottaging

2. Great Lakes–St. Lawrence Lowlands (South)

• Flat, fertile sedimentary plain
• Great Lakes (Superior, Huron, Erie, Ontario) + St. Lawrence River
• Core population: Toronto, Ottawa, Hamilton, London
• Prime agriculture: corn, soy, tender fruit (Niagara)

3. Hudson Bay Lowlands (Far North)

• Vast muskeg (peatlands), permafrost, tidal flats
• Polar bear, caribou, migratory bird habitat
• Cree & Inuit communities (Moosonee, Fort Severn)
• No roads; access by air/rail/barge

4. James Bay Lowlands (Southeast Hudson Bay)

• Similar muskeg terrain
• Major rivers: Albany, Attawapiskat, Moose
• Cree communities (Attawapiskat, Kashechewan)
• Ring of Fire mineral district (chromite, nickel)

Transition Zone

Laurentian Mountains (southern Shield edge) = rolling hills, cottage country (Muskoka, Haliburton, Algonquin Park).