Final answer:
The Canadian Shield is the largest physiographic region in Canada, characterized by ancient rock formations and rich in minerals and timber.
Step-by-step explanation:
The largest physiographic region in Canada is the Canadian Shield. This vast area of ancient geological rock formations covers much of central Canada around Hudson Bay and extends outward from there. Characterized by its rocky terrain and thin, poor soils, the Canadian Shield is noted for its wealth of minerals and timber resources that are crucial to Canada's industries and export economy.
Other significant physiographic regions in Canada include the Cordillera in the west, which is home to mountain ranges such as the Rockies and provides important resources like minerals and timber through mining and lumber mills. To the east are the Appalachian Uplands, with the less rugged but historically significant Appalachian Mountains. The Interior Plains and Prairies cover central parts of Canada and are important to agriculture and are home to a large portion of Canada's population.