What is a cave? The answer depends on where you are and whom you ask. Many definitions have been suggested, some requiring that the cave have a true dark zone, some requiring only that the cave be ?large enough for a person to enter,? or ?feel cavey.? State cave surveys often set minimum limits for eligibility based on length or depth. All of these definitions are imperfect and arbitrary, sometimes contradictory. For example, in a tight, sinuous cave, complete darkness may be reached in a matter of 20 or 30 feet, while a cave with a massive entrance, and 500 feet of large passage may contain no true dark zone. The definition set forth in the Federal Cave Protection Act of 1988 reads in part; ?... any naturally occurring void, cavity, recess, or system of interconnected passages which occurs beneath the surface of the earth or within a cliff or ledge (including any cave resource therein, but not including any vug, mine, tunnel, aqueduct, or other manmade excavation) and which is large enough to permit an individual to enter, whether or not the entrance is naturally formed or manmade. Such term shall include any natural pit, sinkhole, or other feature which is an extension of the entrance.? This politically influenced definition is problematic since it includes far too many features to realistically document. Practically then, each person or entity must define what a cave is depending on his own purposes and surroundings.