The East Coast Fall Line

Along the eastern United States, the hard, ancient rocks of the Piedmont meet the soft, younger sediments of the Atlantic Coastal Plain. Where rivers cross that boundary they tumble over waterfalls and rapids, and this geologic seam is called the Fall Line.

The falls stopped ships sailing upriver from the coast, so the head of navigation became a natural place to unload cargo. The same falling water turned mill wheels. Together, trade and water power seeded a chain of cities, from Trenton and Philadelphia through Baltimore, Washington and Richmond, down to Columbia, Augusta, Macon and Columbus. Interstate 95 roughly follows the same line today.

On this map

• The dashed orange line is a generalized trace of the fall line, drawn through the fall line cities. It runs from New Jersey to Alabama and is not a surveyed boundary.
• Major cities are state capitals and large metros that grew at the falls.
• Minor cities are smaller mill towns and river ports on the same line.

Click any city to see which river and falls it grew up around.

Generated with Claude Code