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Chattahoochee River. Explore This Article. The Chattahoochee River rises high in the Blue Ridge Mountains of Georgia and flows southwesterly toward the Alabama state line. From there the river tumbles for twenty miles over the fall lineâthe region of transition between the foothills of the Piedmont and the lower and flatter Coastal Plain.
It is a tributary of the Apalachicola River, a relatively short river formed by the confluence of the Chattahoochee and Flint rivers and emptying from Florida into Apalachicola Bay in the Gulf of Mexico. The Chattahoochee River is about 430 miles (690 km) long.