Cerje cave
The 27th longest cave in the world
7.1km · Length
Cerje Cave or Cerjanka (Cerjanska pećina) is a cave in southeast Serbia. With the length of 7,149 m (23, 455 ft), it is the second longest cave in Serbia after the 9,818 m (32, 211 ft) long Lazar's Cave.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).