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The shield extends in a great semicircle around Hudson Bay, reaching from the Arctic coast north of Great Bear Lake in the Northwest Territories to northern Québec and Labrador. The Canadian Shield is the largest physiographic region in Canada. It was formed as part of the earth’s crust some 3 billion years ago, and the hard, crystalline rocks of the shield are among the oldest in the world. In the late 19th century, the rockiness of the shield represented a major obstacle to the construction of the Canadian Pacific Railway, Canada’s first transcontinental railway.
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The Canadian Shield occupies an area of 4.6 million sq km in Canada, or nearly half the area of Canada. The region includes portions of six provinces (Newfoundland and Labrador, Québec, Ontario, Manitoba, Saskatchewan, and Alberta) and two territories (Northwest Territories and Nunavut).
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