Portions of its southern edge are exposed in northern Michigan and Wisconsin. Its western edge borders the interior plains and lowlands. It may be traced by the line of lakes running northwest from Lake Winnipeg to Great Slave and Great Bear lakes. The plateau is tilted from a clifflike edge in Quebec and Labrador to sea level around Hudson Bay. The plateau is one of the world's leading sources of iron, nickel, and copper.
Thick forests cover much of the region, but the soil is too shallow and rocky for farming.
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