Laurentian Plateau

Laurentian Plateau or Laurentian Highlands also Canadian Shield

A plateau region of eastern Canada extending from the Great Lakes and the St. Lawrence River northward to the Arctic Ocean. The highland formation also covers much of Greenland and forms the Adirondack Mountains in the United States.

Thesaurus

Noun

1.

Laurentian Plateau - a large plateau that occupies more than 40% of the land area of Canada; it extends from the Great Lakes northward to the Arctic Ocean Canadian Shield, Laurentian Highlands Canada - a nation in northern North America; the French were the first Europeans to settle in mainland Canada; "the border between the United States and Canada is the longest unguarded border in the world"