The
Blue Line is the term used in
New York state for the boundaries of the
Adirondack and
Catskill parks, within which can be found the state's
Forest Preserve. The state
constitution requires that any property owned or acquired by the state in those parks "be forever kept as wild forest lands" and prohibits it from selling or transferring them in any way (save
amending that section of the constitution to allow specific transactions).