Guide
Funatsu Tainai Jukei is a precious geological formation designated as a National Natural Monument, located in Fujikawaguchiko Town, Minami-tsuru District, Yamanashi Prefecture. This site features unique lava tree molds formed when lava from Mount Fuji's eruptions flowed around trees, eventually solidifying while preserving the trees' shapes. The total length of the formation is approximately 20 meters, and its structural beauty holds immense geological value. It is a rare spot where you can witness the raw power of nature firsthand.
This site is more than just a geological relic; it is deeply connected to the spiritual traditions of Mount Fuji. The eruptions that shaped this landscape are a testament to the powerful forces of nature throughout history. Furthermore, the interior of the formation is associated with the worship of Konohana-sakuyahime, the deity of Mount Fuji. This connection highlights the site's role in the long-standing tradition of nature worship in Japan. It is also recognized as part of the cultural landscape of the World Heritage site, 'Mount Fuji, sacred place and source of artistic inspiration.'
The most striking feature is the hollow structure left behind by the trees. As the trees were engulfed by lava and subsequently decayed, they left behind empty cavities, creating a 'cave-like' interior. The 'Tainai-meguri' (exploring the interior) is the primary attraction here. Walking through these natural hollows allows you to experience a unique, immersive space where nature and history converge, offering a sensation that cannot be found anywhere else.
As an outdoor natural site, the scenery changes beautifully with the seasons. Visiting during different times of the year allows you to observe the changing vegetation and the shifting views of Mount Fuji, deepening your connection to the landscape. The facility is generally open from 9:00 AM to 5:00 PM. Visiting during bright daylight hours is recommended, as it allows you to clearly observe the intricate textures and structures of the hardened lava. Please note that visits may be affected by weather conditions to ensure safety.
Visitors can experience 'Tainai-meguri,' which involves walking through the hollowed-out sections of the lava. This allows for a tactile understanding of geological processes, as you move through a space that feels like a natural cave created by the earth's breath. It is an opportunity to feel the traces of Mount Fuji's volcanic history. Please note that exploration is conducted within safe, designated boundaries.
The area around Lake Kawaguchi offers many other wonderful attractions. Nearby spots like the Kawaguchiko Museum of Art, Kawaguchiko Herb Hall, and Oishi Park allow you to enjoy a blend of nature, art, and local cuisine. Since it is located at the foot of Mount Fuji, you can enjoy scenic walks with stunning mountain views and discover local traditional crafts, such as Oishi Tsumugi silk. You can easily plan a diverse travel itinerary utilizing the rich natural environment of Fujikawaguchiko.
Cash may be required for entrance fees or at nearby facilities. Please check local signage or confirm with staff regarding credit card or IC card availability.
While some English signage or multilingual explanations may be available, the primary language for information is Japanese. It is recommended to check information in advance.
Generally, no prior reservation is required to visit, though this may change based on local operational status.
Because the terrain inside the 'Tainai' can be uneven and unstable, please wear comfortable, non-slip footwear such as sneakers or trekking shoes. Dress appropriately for the season and the outdoor environment.
Photography of the natural scenery is permitted; however, please follow local instructions regarding any restricted areas.
Due to the natural geological terrain, there are many steps and uneven surfaces. Accessibility for wheelchairs is very limited.
As a National Natural Monument, it is strictly prohibited to damage or remove any parts of the lava structure. Please respect the environment and its historical value.