The Fall Line was very important in Georgia's history. Rivers in the Coastal Plain tend to be bigger and slow moving - making them open by large boats. But when the boats reached the Fall Line, they couldn't go any further, so trading posts spread along the Fall Line, where materials brought up from Coastal Plain rivers could be traded for material from the Piedmont region. Four important cities grew from this development - Augusta (at the Fall Line of the Savannah River), Milledgeville (at the Fall Line of the Oconee River), Macon (at the Fall Line of the Ocmulgee River), and Columbus (at the Fall Line of the Chattahoochee River). Later, as industrialization progressed, the same cities had the dominance of water power from the “Falls” where they were set.
(Hope this helps) :3