What is the natural boundary that separates the Piedmont Region from the Coastal Plain Region

Answer 1

The natural boundary that separates the Piedmont Region from the Coastal Plain Region is typically the fall line. The fall line is a geological boundary that marks the transition from the hard rock of the Piedmont to the softer, more easily eroded sediments of the Coastal Plain. It is characterized by a series of waterfalls or rapids, as rivers flowing down from the Piedmont encounter this harder rock and drop in elevation.