On this web page you will learn about the 5th physiograhic region of Georgia: The Coastal Plains Region. The Coastal Plains makes up the Southern or Southeastern part of Georgia. Americus, Albany Valdosta, Ridge, and other southeastern cities make up the Coastal Plains region. The Coastal Plains extends east and south of the Fall Line Hills. The Fall Line is a natural boundary that divides the Piedmont region from the Coastal Plains region. The Coastal Plains is divided into two sections: upper and lower.