The natural boundary that separates the Piedmont Region from the Coastal Plain Region is A. The Fall Line.
The natural boundary that separates the Piedmont Region from the Coastal Plain Region is the Fall Line. The Fall Line is a geologic boundary that represents the point where the higher elevation of the Piedmont meets the lower elevation of the Coastal Plain. This boundary is characterized by a series of waterfalls and rapids, which made it difficult for early settlers to navigate and transport goods. To find this answer, you could use various resources such as textbooks, maps, or conduct an online search to understand the geographical features of the Piedmont and Coastal Plain regions.
