HomeProtected PlacesAokigahara Forest (Sea of Trees)
Aokigahara Forest (Sea of Trees) adventures

Aokigahara Forest (Sea of Trees) Adventures

Aokigahara Forest, also known as the Sea of Trees, is a dense, tranquil forest at the northwest base of Mount Fuji, offering a unique natural environment shaped by volcanic activity and renowned for its intricate lava caves.

8,600 acres (approx. 35 km²)
Acres Protected
About 9 miles (14 km)
Miles of Trails
Estimated 150,000–200,000
Annual Visitors
Designated as a protected area in late 20th century
Year Established

About Aokigahara Forest (Sea of Trees)

Aokigahara Forest (Sea of Trees)
 

Aokigahara Forest, located at the northwestern base of Mount Fuji in Shizuoka Prefecture, Japan, spans approximately 35 square kilometers. Formed on hardened lava from Mount Fuji's 8th century eruption, the forest features complex terrain with porous volcanic rock beneath dense tree cover, primarily Japanese cedar and pine. The thick vegetation and unique topography contribute to a stillness and aura that have made it a notable place culturally and ecologically. The forest floor is riddled with lava caves, including the well-known Wind Cave and Ice Cave, which maintain near-constant temperatures year-round, offering fascinating spelunking opportunities.

Ecologically, Aokigahara supports diverse flora and fauna adapted to the volcanic soil, including several bird species and small mammals. Historically, the forest is deeply entwined with Japanese mythology and folklore, often referenced as a mysterious or spiritual place. It also has a somber reputation for being a site where people historically have gone to end their lives, leading to a strong presence of local efforts to increase safety and awareness.

Outdoor enthusiasts visit Aokigahara primarily for hiking and exploration, with marked trails providing access to scenic viewpoints and lava caves. Despite its eerie cultural associations, it is prized for its unique geological features, peaceful environment, and close proximity to Mount Fuji. Visitors should respect local guidelines due to the forest’s sensitive cultural context and the risks posed by its rugged terrain.

Highlights

Highlight

Aokigahara Jukai Trail – The primary hiking trail through the forest with interpretive signage

Highlight

Narusawa Ice Cave – A naturally formed lava cave with year-round ice formations

Highlight

Fugaku Wind Cave – A historic lava tube famous for its constant wind flow

Highlight

Serene mountain views of Mount Fuji from multiple forest clearings

Notable Natural Features

Lava Formations

The landscape is defined by extensive hardened lava flows and unique geological formations created by ancient volcanic eruptions.

Ice and Wind Caves

Two prominent lava tubes that provide cool, stable environments preserving ice formations and natural wind tunnels throughout the year.

Dense Forest Canopy

Predominantly composed of Japanese cypress and fir, the forest canopy blocks sunlight, creating a quiet, ethereal atmosphere.