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Map of Washington DC, Piedmont Plateau and Atlantic Coastal Plain  

Did You Know?
The Civil War Defenses of Washington exist because of geology and topography. The strategic high ground where the fortifications are located stretches between two considerably different geologic terrains: the Piedmont Plateau to the north and west and the Atlantic Coastal Plain to the east.

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Last Updated: June 26, 2006 at 10:35 EST