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      • It is a gigantic trough, including a chain of valley lowlands, and the central feature of the Appalachian Mountains system. The trough stretches about 1,200 miles (1,900 km) from Quebec in the north to Alabama in the south and has been an important north–south route of travel since prehistoric times.
      en.wikipedia.org/wiki/Great_Appalachian_Valley
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  2. The Great Appalachian Valley, also called The Great Valley or Great Valley Region, is one of the major landform features of eastern North America. It is a gigantic trough, including a chain of valley lowlands, and the central feature of the Appalachian Mountains system.

  3. Great Appalachian Valley, longitudinal chain of valley lowlands of the Appalachian mountain system of North America. Extending from Canada on the northeast to Alabama, U.S., on the southwest, it includes the St. Lawrence River valley in Canada and the Kittatinny, Cumberland, Shenandoah, and Tennessee river valleys in the United States.

    • The Editors of Encyclopaedia Britannica
    • Overview
    • Physiography

    Appalachian Mountains, great highland system of North America, the eastern counterpart of the Rocky Mountains. Extending for almost 2,000 miles (3,200 km) from the Canadian province of Newfoundland and Labrador to central Alabama in the United States, the Appalachian Mountains form a natural barrier between the eastern Coastal Plain and the vast In...

    The system may be divided into three large physiographic regions: northern, central, and southern Appalachia. These include such mountains as, in the northern area, the Shickshocks (French: Chic-Chocs) and the Notre Dame ranges in Quebec; the Long Range on the island of Newfoundland; the great monadnock (isolated hill of bedrock) of Mount Katahdin in Maine; the White Mountains of New Hampshire; and Vermont’s Green Mountains, which become the Berkshire Hills in Massachusetts, Connecticut, and eastern New York. New York’s Catskill Mountains are in central Appalachia, as are the beginnings of the Blue Ridge range in southern Pennsylvania and the Allegheny Mountains, which rise in southwestern New York and cover parts of western Pennsylvania, western Maryland, and eastern Ohio before merging into the third, or southern, region. This area includes the Alleghenies of West Virginia and Virginia; the Blue Ridge range, extending across Virginia and western North Carolina, the northwestern tip of South Carolina, and the northeastern corner of Georgia; the Unaka Mountains in southwestern Virginia, eastern Tennessee, and western North Carolina (of which the Great Smoky Mountains are a part); and the Cumberland Mountains of eastern Kentucky, southwestern West Virginia, southwestern Virginia, eastern Tennessee, and northern Alabama.

    The highest elevations in the Appalachians are in the northern division, with Maine’s Mount Katahdin (5,268 feet [1,606 metres]), New Hampshire’s Mount Washington (6,288 feet), and other pinnacles in the White Mountains rising above 5,000 feet (1,525 metres), and in the southern region, where peaks of the North Carolina Black Mountains and the Tennessee–North Carolina Great Smoky Mountains rise above 6,000 feet (1,825 metres) and the entire system reaches its highest summit, on Mount Mitchell (6,684 feet [2,037 metres]).

    A distinctive feature of the system is the Great Appalachian Valley. It includes the St. Lawrence River valley in Canada and the Kittatinny, Cumberland, Shenandoah, and Tennessee valleys in the United States; the latter is the site of the world-famous Tennessee Valley Authority (TVA), a government agency for natural resource conservation, power production, and regional development.

    In the area known geologically as “New” Appalachia, especially where there are softer limestone rocks that yield to the constant solution by water and weak acids, numerous caves are a distinctive feature of the physiography. The chief caverns lie within or border the Great Valley region of Pennsylvania, Maryland, West Virginia, Virginia, and Tennessee. Caverns of the Shenandoah Valley in Virginia provide well-known and dramatic examples of underground passages, rooms, watercourses, formations, and other cave features that honeycomb much of the land below central and southern Appalachia.

  4. A distinctive feature of the Appalachian system is the Great Appalachian Valley, a chain of valley lowlands that has been one of the main paths through the mountains since pioneer times. It includes the St. Lawrence River valley in Canada and the Kittatinny, Cumberland, Shenandoah, and Tennessee valleys in the United States.

  5. One of the most notable features of the Appalachian Mountains is the Great Appalachian Valley, which extends from Canada to Alabama. This valley includes the St. Lawrence River Valley in Canada and the Cumberland, Shenandoah, and Tennessee Valleys in the United States.

  6. Jul 19, 2021 · The Great Appalachian Valley comprises the St. Lawrence River Valley in Canada and Tennessee, Shenandoah, Cumberland, and Kittatinny valleys in the United States.

  7. May 28, 2024 · The great Appalachian Mountains are found on the eastern side of the United States. They are some of the oldest natural landmarks in the US. The mountains provide a rich source of natural resources and spill over to Canada.

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