Great Appalachian Valley
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Great Appalachian Valley:see under Appalachian MountainsAppalachian Mountains
, mountain system of E North America, extending in a broad belt c.1,600 mi (2,570 km) SW from the Gaspé Peninsula in Quebec prov., Canada, to the Gulf coastal plain in Alabama. Main sections in the system are the White Mts., Green Mts.
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