Georgia is the largest state E of the Mississippi River and has three main topographical areas. Extending inland from the coast is a low coastal plain that covers the southern half of the state. In mountainous N Georgia are the Appalachian Plateau, the valley and ridge province, and the Blue Ridge province. Bridging these two sections and embracing about one third of the state is the Piedmont foothill region in central Georgia. A number of islands, part of the Sea Islands chain, lie off Georgia's coastline.
The state is well drained by many rivers, including the Savannah, which forms the boundary with South Carolina; the Ocmulgee and the Oconee, which merge in the southeast to form the Altamaha; the Chattahoochee, which forms part of the Alabama boundary and joins with the Flint in the extreme southwest corner of the state to form the Apalachicola; and the Saint Marys, which rises in the large Okefenokee Swamp and forms part of the Georgia-Florida line. The most important cities are Atlanta, Columbus, Savannah, Macon, and Albany.
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