Aokigahara Forest, known as the Jukai or ‘Sea of Trees’, is a dense woodland grown atop a hardened lava plateau formed by an ancient eruption of Mount Fuji over a thousand years ago, its trees rooted in the rocky volcanic ground rather than deep soil. The forest offers well-marked nature trails and access to lava caves, including atmospheric ice caves that stay cold year-round, and while it has a reputation in popular culture, for visitors it is simply a striking and unusual volcanic woodland best explored along its established, signposted paths.
🗓️ At a Glance
| Location | Fujikawaguchiko / Narusawa, Yamanashi |
| Hours | Trails daytime; caves have set hours |
| Admission | Trails free; caves small fee |
| Time needed | 1.5–3 hours |
| Best time | Spring–autumn; caves cool even in summer |
What to See
- The dense ‘Sea of Trees’ rooted in a volcanic lava plateau.
- Well-marked nature trails through the unusual forest.
- Atmospheric lava ice caves that stay cold year-round.
- A striking example of Fuji’s volcanic landscape.
Combine Your Visit
- Combine with Kawaguchiko & Fuji Five Lakes sightseeing nearby.
- Pair with Mt Fuji World Heritage Sites for more volcanic landscape context.
- Read our Yamanashi overview .
Getting There
- By bus: local buses reach the forest’s main trailheads and caves from Kawaguchiko.
- By car: parking available near the Narusawa Ice Cave and main trailheads.
Tips
Stick strictly to the established, signposted trails, as the dense forest and uneven lava terrain make it genuinely easy to lose your bearings off-path, and mobile signal can be unreliable. Bring a light layer for the ice caves, which stay cold year-round and can have slippery, low passages requiring care.
