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18 Mar 07

05 Jun 06

Dynamic Map
Map of Appalachian Mountains
Appalachian Mountains or Appalachians, great mountain system of eastern North America, nearly parallel with the Atlantic coast, and extending from the province of Québec in Canada to northern Alabama. The system is 2,400 km (1,500 mi) long and varies from 160 to more than 480 km (100 to more than 300 mi) in width. Its altitude varies between 460 and nearlyy 2,040 m (1,500 and nearly 6,700 ft). The three divisions of the system—northern, central, southern—vary considerably in geologic age, having been raised by a series of crustal plate collisions that began during the Ordovician period and climaxed in the Permian (see Plate Tectonics).
- Allegheny Mountains, along the West Virginia–Virginia border, are the westernmost ridge of the Valley and Ridge Province, and are part of the Allegheny Front. - on 2006-06-05
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03 Jun 06

The Monongahela River (affectionately referred to as The Mon) is a river on the Allegheny Plateau in West Virginia and Pennsylvania in the United States. At Pittsburgh, it meets the Allegheny River to form the Ohio River.

The Monongahela is formed by the conflluence of the West Fork River and the Tygart Valley River at Fairmont, West Virginia. It is one of the largest rivers in the United States to flow generally northward. The river is navigable its entire length with a series of lock/dams ensuring a 9' depth. In Pennsylvania, the Monongahela is met by two major tributaries: the Cheat River, which joins at Point Marion; and the Youghiogheny River, which joins at McKeesport.