Baengnyongdonggul Cave is a 1.8㎞-long, natural limestone cave located in Pyeongchang-gun, Gangwon-do. The cave entrance is located 10-15㎞ above sea level, and is surrounded by rocks. In 1976, local residents expanded a small lane in the middle of the main cave corridor to allow for easier exploration. Since then, the cave has continued to be explored and researched with great value for geologists. The cave was designated Natural Monument No. 260 in 1979.