The cockpit country of Kentucky is the best North American example of a type of terrain in which limestone-based karst landscape is filled with depressions. The pits form when the underlying limestone dissolves and the surface of the ground subsides or collapses into subterranean channels or caves. The resulting small, enclosed basins vary in dimension, but are often of just the right size to contain a clandestine cockfight, a sport reputed to survive in parts of Kentucky

Barbara Kingsolver