Aokigahara National Forest

Aokigahara Cave Systems Facts


Ice Caves

  • Approximately 70 feet down to the entrance
  • Ice all year round
  • Natural refrigerator
  • Average temperature 3ºC or 37.4º F
  • 156 meters or 511 feet in length.


Wind Caves

  • Largest lava tube in the forest
  • 201 meters or 659ft in length
  • Average of 8.7 meters or 28.5 feet in height
  • used to store silk worm eggs
  • Sometimes sounds like ghosts howling


Bat Caves

  • largest of the three major caves
  • 925 meters or 3034 feet above sea level
  • Is about 386 meter or 1266 feet in length
  • Approximately 500 bats live in the cave.
  • 5 kinds of bats present: Greater Horseshoe, Little Japanese Horseshoe, Eastern Long-fingered, Japanese Long-eared, and Hilgendorf’s Tube-nosed


Narusawa Ice Caves


Fugaku Wind Caves


Lake Sai Bat Cave



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