The Canadian Shield is a broad region of Precambrian rock (pictured in shades of red) that encircles Hudson Bay. It spans eastern, northeastern, and east-central Canada and the upper midwesternUnited States.
The Canadian Shield is also called the Laurentian Plateau, or Bouclier canadien (French).
A continuation of the shield is in west Greenland, to which it was once connected. In the United States the shield is mostly covered with much younger rocks and sediment.