Final answer:
The Piedmont region borders the Coastal Plain in Georgia, characterized by its rolling hills and small mountains like Stone Mountain.
Step-by-step explanation:
The geographic region of Georgia that borders the Coastal Plain is the Piedmont. This region consists of lower, rolling hills and small mountains, such as the well-known Stone Mountain. The Piedmont is adjacent to the southeastern basin of the Valley and Ridge province. It is composed of igneous and metamorphic rock from old mountain chains and signifies the transition between higher elevations and the flat, coastal areas of the Coastal Plain, which extends along the Atlantic Ocean and the Gulf of Mexico from New England to Texas.