Final answer:
The Piedmont region is the most highly populated region of Georgia and contains most of its cities, including Atlanta.
Step-by-step explanation:
The most highly populated region of Georgia, which also contains most of its cities including Atlanta, is the Piedmont region. The Piedmont province is located southeast of the Blue Ridge and is characterized by lower, rolling hills along with small isolated mountains. It is composed of igneous and metamorphic rock and is rich in geological resources.