Overview
Fugaku Wind Cave is a natural lava cave located in the Aokigahara Forest at the northwestern base of Mount Fuji in Yamanashi Prefecture. Formed by lava flows from ancient eruptions of Mount Fuji, the cave is part of a larger volcanic landscape that includes several other lava tubes in the region.
The cave is relatively easy to explore compared to many wild caves, as it is maintained with pathways and lighting. For foreign visitors, Fugaku Wind Cave offers a safe and accessible introduction to volcanic geology while providing a cool retreat during the warmer months.
Geological Formation and Natural Features
Lava Tube Origin
Fugaku Wind Cave was created when the outer surface of a lava flow cooled and solidified while molten lava continued to flow inside. Once the lava drained away, it left behind a hollow tunnel. The cave extends approximately 200 meters in length and maintains a relatively consistent width and height.
Naturally Cool Interior Climate
The cave maintains a stable temperature of around 3°C (37°F) throughout the year. Even in summer, the interior remains cold. Historically, this natural refrigeration allowed local residents to store silkworm eggs and agricultural products before modern refrigeration was available.
Ice Pillars and Lava Shelves
During colder months, small ice formations may develop inside the cave. Visitors can also observe smooth lava walls, layered rock formations, and shelf-like structures created by changing lava levels during the eruption.
Surrounding Environment: Aokigahara Forest
Volcanic Terrain
The cave is located within Aokigahara Forest, a dense woodland formed on hardened lava. The uneven ground, covered with moss and tree roots, reflects the rugged volcanic foundation beneath the forest.
Walking Trails
Designated walking paths connect Fugaku Wind Cave with nearby natural attractions. The forest trails are generally well maintained but may be uneven due to volcanic rock formations.
Nearby Lava Caves
Another notable cave in the area is Narusawa Ice Cave, which features more prominent ice formations and a slightly different internal structure. Many visitors choose to explore both caves in a single trip.
Visitor Experience and Safety
Interior Pathways
The cave is equipped with wooden walkways, stairs, and lighting, making it accessible to most visitors. However, the floor can be damp or slippery, so appropriate footwear is recommended.
Low Ceilings
Certain sections of the cave have low ceilings, requiring visitors to bend down while walking. Protective helmets are typically provided at the entrance.
Duration of Visit
A typical exploration takes approximately 20 to 30 minutes. Combined with forest walks, visitors often spend one to two hours in the area.
Access and Practical Information
Location
Fugaku Wind Cave is located near Lake Saiko in Yamanashi Prefecture, within the Fuji Five Lakes region. The area lies northwest of central Mount Fuji.
Transportation
The cave can be reached by car from Kawaguchiko Station in about 20 to 30 minutes. Limited bus services operate in the area, but schedules may be infrequent, so checking in advance is recommended.
Admission and Hours
An entrance fee is required. Opening hours may vary seasonally, and access can be affected by weather conditions, particularly during heavy snowfall.
Best Time to Visit
The cave is open year-round, but summer is especially popular due to the cool interior temperature. Autumn provides pleasant weather for exploring the surrounding forest.
Visitor Guidelines
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Wear warm clothing, even in summer
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Use provided helmets where required
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Follow marked paths and safety instructions
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Do not touch or damage natural rock formations
Fugaku Wind Cave offers foreign visitors a unique opportunity to experience the geological power of Mount Fuji from within its volcanic legacy. The combination of natural science, cool subterranean atmosphere, and surrounding forest landscape makes it a memorable stop in the Fuji Five Lakes region.
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Official Website
https://www.mtfuji-cave.com/en/wind_cave/
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