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

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The natural boundary that separates the Piedmont Region from the Coastal Plain Region is typically defined by the Fall Line. The Fall Line is characterized by a transition from the hard, crystalline rocks of the Piedmont to the softer sediments of the Coastal Plain. This line often corresponds with a series of waterfalls and rapids along rivers, marking a significant change in geography and hydrology between the two regions.

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______________ region is the most highly populated region in Georgia and contains most of the state's major cities, including Atlanta.