![]() ![]() The Appalachian chain is a barrier to east–west travel, as it forms a series of alternating ridgelines and valleys oriented in opposition to most highways and railroads running east–west.ĭefinitions vary on the precise boundaries of the Appalachians. They once reached elevations similar to those of the Alps and the Rocky Mountains before experiencing natural erosion. The Appalachians first formed roughly 480 million years ago during the Ordovician Period. ![]() The Appalachian Mountains ( French: Appalaches), often called the Appalachians, are a system of mountains in eastern to northeastern North America. ![]() Newfoundland and Labrador, Saint Pierre and Miquelon, Québec, Nova Scotia, New Brunswick, Maine, New Hampshire, Vermont, Massachusetts, Connecticut, New York, New Jersey, Pennsylvania, Maryland, Washington, D.C., Delaware, Virginia, West Virginia, Ohio, Kentucky, Tennessee, North Carolina, South Carolina, Georgia and AlabamaĤ0°N 78°W / 40°N 78°W / 40 -78 Coordinates: 40°N 78°W / 40°N 78°W / 40 -78 ![]()
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