2) Piedmont or "Foothill" Province: extends from Fall Line to base of Catoctin Mountains;
3) Blue Ridge Province: in western Frederick County;
4) Valley and Ridge Province: extends between South Mountain (Washington County) and Dans Mountain (Allegany County);
5) Appalachian Plateau Province: extends from base of Catoctin Mountains to western boundary of State.
Mean elevation, 350 feet.
Maximum elevation, 3,360 feet at Backbone Mountain.
July 1, 2009
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