Funatsu Lava Tree Molds, Natural monument and worship site in Fujikawaguchiko, Japan
Funatsu Lava Tree Molds are a series of cylindrical caves carved through solidified lava flows on Mount Fuji's northern base. The formations developed when flowing lava surrounded standing trees, leaving stone shells as the wood decomposed.
These formations developed about 1,000 years ago when volcanic lava from Mount Fuji flowed across a forest, encasing tree trunks in stone. This volcanic event shaped the landscape permanently.
These caves held spiritual importance for Fuji-ko pilgrims who performed purification rituals before climbing Mount Fuji. The practices connected worshippers to the mountain's volcanic power.
Plan your visit through guided tours at the Kawaguchiko Field Center, which offer information about volcanic processes. These tours help visitors understand the formations and their geological history.
The interior temperature of these caves remains constant throughout the year, preserving evidence of the exact width of ancient trees that once stood here. This natural stability has allowed researchers to learn details about the vegetation from 1,000 years ago.
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