the Livenza's Swamp, or Palù, is a place of great archaeological interest, a vast marshy area at the foot of the mountains, in Polcenigo. The area, which has been partly reclaimed in prehistoric times was mainly occupied by marshes, islets and ponds. The first human settlements date back to the early Palaeolithic, as the finds lithic discovered. During the Neolithic period, between 4500 and 3600 B.C. there was then a pile-dwelling settlement. In the eighties and nineties during some excavations and underwater reconnaissance were in fact found of wooden huts and objects lithic, such as knives and arrowheads. The site of Palù di Livenza was declared a UNESCO world heritage site on 27 June 2011 and has been included in the list of 111 sites European lake-dwelling of the alpine arc.