Lake Saiko Bat Cave

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A nationally designated Natural Monument It was opened to the public in April 1998 and has lava stalactites and a ropy-lava bed. The cave has branch caves and the total is 350 meters long, which is the largest scale among lava caves at the foot of Mt.Fuji. Inside the cave, you can see stalactite and ropy-lava rock which were formed when the lava from Mt.Fuji’s eruption was exposed to air and got solid emitting gases. As it is not very cool in summer and is warm in winter inside the cave, and as it is different from other caves, many bats lived in the past for their hibernation. However, land developments and random trespassing brought the bats to the brink of extinction. Now, the cave is managed and the preservation area was placed in the back, so the number of the bat is growing little by little every year.

Venue Address

401-0332 2068 Saiko, Fujikawaguchiko-machi, Minami-tsuru-gun

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Other Indoor Activities

  • The Narusawa area’s roadside rest and shopping hub offers the visitor splendid views of Mount Fuji and much more. The shop in the main building sells freshly harvested local highland fruits and vegetables, as well as locally brewed sake and ready-to-eat condiments.

  • Viewing Mount Fuji on its own is splendid enough, but it is in relation to the surrounding mountains that one can begin to comprehend the sheer scale and size of Japan’s most iconic mountain. This observation deck offers that opportunity.

  • Aokigahara is a dense, primeval forest of mixed coniferous and broadleaf trees stretching across 30 square kilometers. The forest floor consists of volcanic rock, which is hardened lava that flowed from Mount Fuji when the volcano had a major eruption in the year 864.

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