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Northern Piedmont

Ecoregion in VA, District of Columbia, MD, PA, DE

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The Northern Piedmont is a transitional region of low rounded hills, irregular plains, and open valleys in contrast to the low mountains of Ecoregions 58, 66, and 67 to the north and west and the flatter coastal plains of Ecoregions 63 and 65 to the east. It is underlain by a mix of metamorphic, igneous, and sedimentary rocks, with soils that are mostly Alfisols and some Ultisols. Potential natural vegetation here was predominantly Appalachian oak forest as compared to the mostly oak-hickory-pine forests of the Piedmont (45) ecoregion to the southwest. The region now contains a higher proportion of cropland compared to the Piedmont.

— EPA

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Ecoregion