According to Official Guinness Records,
The longest line of bunting is 17,600 m (57,742 ft 8 in) long and was achieved by Poeler Einwohner und Freunde (Inhabitants and Friends of Poel) in Insel Poel, Germany, on 25 August 2013.
For a complete list of 2013 records, please visit 2013 Guinness Records in Germany.