Caves - 洞穴

Mount Fuji's past eruptions and resulting lava flows have created multiple caves in the Fuji Five Lake region around the mountain's northern base. Today, three of these caves have been developed and opened to tourists to be explored without special equipment or guides. Take caution, however, as some of the caves have passages with low ceilings and steep steps that can be slippery when wet.


Ice Cave - 鳴沢氷穴

Even during the summer, the temperature in the Ice Cave usually stays below freezing. Consequently the cave has been used since the early 1900s to store ice for use around the year. The circular walk through this cave is not very long, but contains passages with low ceilings and slippery stairs.


These remnants were used to preserve silkworm cocoons and seeds. To prevent growth of the cocoons and to preserve the quality of seeds and promote budding, they were stored in a refrigerated environment.

This well was actually used before water service came into being.

Remnants of huge trees that grew 1100 years ago. The ceiling is 91cm high, and you can walk through the tunnel sideways.

This is a reproduction of an ice storage unit. The wall was formed by piling up blocks of ice. It was used before refrigerators came into being.

Water droplets seeping from the ceiling freeze into icicles, which pile up into ice pillars. They are a beautiful, natural work of art. Natural ice forms during winter, and can be seen until about the beginning of the fall season.

Please climb slowly, as the steps are wet and slippery. Trying to climb it fast will quickly wear you out. Use caution when climbing.



Hours: 9:00 to 17:00 (shorter hours in winter; longer hours in summer) 

Closed: No closing days 

Admission: 350 yen


 

Wind Cave - 富岳風穴

In the past, this cave was used as a natural storehouse and refrigerator, as the temperature inside stays at a relatively constant zero degrees Celsius throughout the year. The cave is furnished with a few shelves that store boxes of acorns and silkworm cocoons. It is the most easily walkable and least exciting of the three caves.


The entrance is a wide gaping hole situated amid the lush forest. The ceiling below the staircase is low, so be sure to watch your head.

The walls of ice are reminiscent of a culture long ago when natural ice was cut up into blocks and stacked in piles for use as a natural refrigerator.

Before the lava completely hardened, its walls would peel away in the shape of a log.

This is where lava has been raised up in a rope-like manner, due to the slower downstream flow of lava being pushed down from the top.

Until around 1955, the cave served as a storage place for seeds and cocoons that were actually used. In order to keep them from growing, and to preserve good quality seeds for better budding, the cocoons and seeds were kept in cold storage.

This is a type of moss that is technically called "silicate hana". It grows on rock walls and has a bluish-white shine. The extensive reflection of silver is said to be unusual.

This is where lava has melted into ponds, which then cool down, leaving solidified pond formations in their original shape.



Hours: 9:00 to 17:00 (shorter hours in winter; longer hours in summer) 

Closed: No closing days 

Admission: 350 yen


 

Bat Cave

コウモリ穴

The Bat Cave, named after its former winter inhabitants, is the most extensive of the three caves. In total the cave is nearly 350 meters long and has multiple large chambers and diverging tunnels to be explored. Some of the tunnels come with rather low ceilings.


Hours: 9:00 to 17:00 (shorter hours in winter; longer hours in summer) 

Closed: No closing days 

Admission: 300 yen



The information on this page is updated in April 2016.
The possibility want that information has been changed, please check the official website of each facility.