fall line

Fall line is a phrase both metaphoric and literal. In broader terms, it means the zone where the Piedmont foothills level out into the coastal plain, where sandy soil derived from marine deposits replaces rocky rolling land. On some southeastern rivers, such as in the Carolinas and Virginia, the Fall Line is a specific place where shoals and rapids once stopped navigation from the coast because ships couldn’t pass through. Cities such as Richmond, Fayetteville, and Columbia sprang up at the head of navigation, and mills and factories were built to take advantage of the water power at the falls and rapids. The abrupt change of elevation caused industry and commerce, courts and seats of government, to take root in those areas.

Robert Morgan