What is the name of rocky region that spans most of eastern Canada?

The name of the rocky region that spans most of eastern Canada is the Canadian Shield. This large area is characterized by its ancient rock formations, rugged landscape, and extensive forest cover. It stretches from the Arctic in the north to the Great Lakes in the south and includes parts of several provinces and territories, including Ontario, Quebec, Manitoba, and Nunavut. The Canadian Shield is known for its mineral resources, such as gold, silver, and iron ore, and its importance in shaping the region's geology and natural environment.