In the American South, there are state borders, variations in topography and accents. There's also the gnat line. That's the fall line where the piedmont meets the coastal plain. It's actually the sandy soil south of the line where gnats or pesky little critters live out their short lives, but they also have a penchant for flying into noses and eyes. Larry Walker joined On Second Thought on the line from Perry to explain his adventures below the gnat line. His new book, Tales From Georgia's Gnat Line , is a series of essays about life in the deep South.