In my classes at the CFC, the great land mass of Canada is commonly considered indefensible, yet unassailable.

It is too much territory to cover, yet so big and open once landed on, it would be relatively simple to repulse an attacker. Much of the hospitable areas have local communities that would notice an invasion. The areas that have sparse human habitation get Canadian Ranger patrols occasionally.

Any invader into these areas really wouldn't accomplish much other than be really sorry about being in the frozen wastelands of Canada (coming from someone who spent a whole 4 days in Iqaluit, the capital of Nunavut).

Tankersteve