Simple map of the three physiographic provinces of North Carolina.
This is simple map of the three physiographic provinces of North Carolina.  Major contacts based on the following:   Coastal Plain / Piedmont Province:  a line delineating the last contiguous occurence of Coastal Plain sedimentary deposits. Termed Fall Line, this is in reality a zone ranging up to several miles depending on location, and marks the boundary between crystalline (Piedmont) rocks and the softer sediments of the Coastal Plain.  Small waterfalls and rapids are common in this zone along major drainages that cross this boundary.

Piedmont / Mountain boundary:  A line that follows the Brevard Fault Zone for much of the central area of this boundary.  This line varies to the north and the south and is based on major differences in altitude.  To determine the Piedmont / Blue Ridge boundary, the 2001 State LiDAR (150-foot spatial resolution) was used as a data layer guide. A line was digitized using the heads-up method at a zoom scale of between 1:24,000 and 1:100,000 near and parallel to the  Brevard Fault trace.  The linework generally follows the 1500-foot contour for much of this boundary.
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