Final answer:
The Canadian Shield is the physiographic region that covers most of Canada, characterized by its large area of rock and forests, surrounding the Hudson Bay.
Step-by-step explanation:
The physiographic region that covers most of Canada is The Canadian Shield. This region is a vast area of rock and forest that encircles the Hudson Bay and covers much of central Canada. The Canadian Shield is geologically the oldest part of North America and is known for its rich mineral deposits. Despite its rocky terrain and poor soil quality, which make it less suitable for agriculture, it is a significant source of timber and minerals for Canadian industries and for export.