Aokigahara: History and Folklore of the Sea of Trees

Content Note

This article discusses suicide in the context of Aokigahara’s history and reputation. It contains no method details or graphic description. If this subject feels close to home, support is available below — you are not alone.

United Kingdom: Samaritans — call 116 123 (free, 24/7).

Japan: TELL Lifeline — call 0800-300-8355 toll-free or use online chat (hours vary).

United States: call or text 988 (Suicide & Crisis Lifeline).

Introduction

You notice the quiet before you notice anything else.

Not the ordinary hush of woodland, where birdsong thins and the wind moves somewhere overhead. In Aokigahara the wind does not reach you. The trees stand so close, and the ground beneath them is so strange, that sound simply stops — it goes into the moss and the black rock and does not come back. Within a few hundred metres of the trail your own breathing becomes the loudest thing in the world. People who walk here describe the same involuntary reflex: they stop talking. There is nothing to talk over, and the silence makes conversation feel like something you are imposing on a room where others are trying to sleep.

Then you look down, and the ground is wrong. The floor of this forest is not soil. It is hardened lava, and the trees have been forced to solve an impossible problem — roots that cannot dig grow sideways instead, spreading across the rock in pale, muscular ropes, gripping a surface that will not let them in. Everything is holding on. The effect is a forest that looks, at every turn, exactly like the turn before it: the same green light, the same twisted roots, the same closed walls of trunk. No landmark. No gradient. No way to tell how far in you have come.

It is genuinely beautiful. That is the thing no one warns you about. The moss is vivid, the light is soft and underwater-green, and the whole place has the stillness of somewhere sacred. And it is precisely that beauty, sitting on top of what everyone knows about this forest, that starts to work on you — a slow pressure you cannot quite name, the sense that the quiet is not empty but occupied, that the forest is paying a kind of attention.

That sensation has a name in Japanese folklore. It also has an explanation in the volcanic rock under your feet. Aokigahara is where those two answers stop being separate.

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The Place

Aokigahara sits at the northwestern foot of Mount Fuji, in Yamanashi Prefecture, about two hours west of Tokyo. On a map it is a rough green oval of roughly thirty square kilometres, hemmed by two of the Fuji Five Lakes — Saiko and Shojiko — and threaded by a handful of marked trails. Seen from the mountain’s slope, it explains its own name. The canopy is so uniform and so dense that in the wind it moves as a single surface, rolling and settling like water. The Japanese call it Jukai: the Sea of Trees.

The name is doing more than describing a view. A sea is something you can be lost at, something without landmarks, something that closes over whatever goes under. Inside the forest that second meaning becomes physical. The trees — mostly hinoki cypress and Fuji cherry, evergreen and broadleaf tangled together — grow close enough that the light arrives filtered and green, and the density flattens distance. There are no long views. The forest looks the same in every direction, at every depth, and it stays that way for kilometres.

Underneath is the reason. The ground is not earth but rock: a floor of hardened basaltic lava, porous and uneven, riddled with hollows and buckled into ridges. Nothing about walking here is normal. Roots that cannot go down go sideways, spreading over the rock in thick exposed ropes that the moss then softens into something almost tender, so that the whole floor looks upholstered. Step off the trail and the surface fights you — ankle-turning, root-laced, laddered with small drops into lava cavities you don’t see until you’re at their edge. It is one of the easiest places in Japan to become genuinely lost.

And yet, for most of the people who come, it is a nature reserve. Families visit the lava caves — the Narusawa Ice Cave, frozen year-round, and the Fugaku Wind Cave, whose basalt walls swallow sound so completely that a shout dies where it leaves your mouth. Both were used for centuries as natural refrigeration; in the Edo period ice was carried from caves like these to the shogun’s court. There are guided ecology walks, and there is shinrin-yoku, forest bathing, the practice of sitting inside the quiet and letting it slow you down. To stand on the Aokigahara trail on an ordinary afternoon is to stand in an extraordinarily beautiful, entirely ordinary wood. The trouble is what everyone standing there already knows, and cannot un-know.

The History of Aokigahara

The forest is younger than it looks, and younger than most of what it’s associated with. It did not accumulate over deep geological time. It began, more or less, on a date.

In the year 864, Mount Fuji erupted from a vent on its northwestern flank in an event now called the Jogan eruption — one of the largest in the mountain’s recorded history, a months-long outpouring of lava that buried the land at Fuji’s base and drowned an existing lake, splitting it into the smaller lakes that survive today. Shinto belief at the time read the eruption as divine anger, and had the shrines to prove it. When the lava finally cooled it left a vast, sterile plateau of black rock. Aokigahara grew on top of that — seeds carried in by wind and birds and animals, cypress and cherry taking hold in the cracks, a forest assembling itself over the following eleven centuries on a foundation of hardened fire. The strangeness a visitor feels underfoot is not atmosphere. It is the eruption, still there, barely hidden.

That much is settled. The forest’s association with death is far older than its modern reputation but far vaguer in the record, and this is where an honest history has to slow down and separate what is documented from what merely gets repeated.

The oldest layer is religious. Fuji was sacred; its base inherited that sacredness, and a forest this silent and this disorienting became, in the Japanese imagination, a threshold — a place where the boundary between the living world and whatever lies beside it grew thin. By the Edo period Aokigahara was understood as that kind of liminal ground. Buddhist ascetics are said to have entered it to meditate and, in some accounts, to fast to death as a form of purification. Priests performed rites there. None of this is a ghost story in the modern sense; it is a landscape treated as spiritually charged, which is a different and older thing.

Layered onto that is the legend most often cited and least often verified: ubasute. The word means, bluntly, the abandoning of an old woman — the practice of carrying an older or infirm relative to a remote place and leaving them to die when famine made another mouth unfeedable. The forest is frequently named as a site where ubasute was performed. This is exactly the kind of claim that hardens into fact through repetition, so it’s worth holding at arm’s length. Many Japanese historians argue that ubasute was rare, or largely literary — a motif inherited from Buddhist story traditions and folktale rather than a widespread custom, appearing far more often in legend than in any documented case. Whether it happened here at any scale is genuinely uncertain. What is certain is that the story attached itself to the forest and stayed, and that Aokigahara’s later reputation grew in soil the ubasute legend had already prepared.

Then, in 1960, the modern era began with a book.

Seichō Matsumoto was one of Japan’s most celebrated crime writers. His 1960 novel Nami no Tō (Tower of Waves) follows a love affair that cannot survive its circumstances and closes with its heroine entering Aokigahara in despair. Matsumoto did not create the forest’s darker associations, but he helped give them a modern literary shape. The novel was widely read and repeatedly adapted for television, and later accounts reinforced that framing.

The deaths connected with Aokigahara are real, as is the grief around them. Its international reputation, however, was amplified by literature and media — including Matsumoto’s novel and a notorious 1993 bestseller. That distinction matters: stories have shaped how the place is perceived, but they should not eclipse the people affected or turn tragedy into folklore.

Japanese authorities and local volunteers have spent decades trying to reduce harm. Trailhead signs encourage people in distress to contact family and seek help, while staff and volunteers patrol the area. Local officials also stopped releasing location-specific annual figures, a decision widely reported as an effort to avoid feeding sensational coverage.

The Legend: Yurei in the Sea of Trees

The supernatural Aokigahara — the one the ghost stories describe — is populated chiefly by yurei.

A yurei is not a Western ghost, and translating it as one loses almost everything that matters. In the Japanese understanding, the spirit at death is meant to move on and, in time, join the ancestral dead, provided the proper rites are observed and the person leaves the world without a violent surplus of feeling. A yurei is what remains when that passage fails — a spirit held in place by an emotion too strong to let it go: grief, rage, jealousy, a wrong unavenged, a love that had nowhere to land. It is bound not to a house, as a Western ghost so often is, but to the emotion itself, and to the place where the emotion broke. It does not rattle chains or perform for the living. It waits, and it wants, and its wanting is the whole of it.

Within this folklore, deaths without customary rites can leave spirits unable to move on, which is why yūrei stories became attached to Aokigahara. Retellings often portray the forest’s silence and disorientation as supernatural influence. These are cultural narratives, not evidence that the forest causes or encourages suicidal behaviour, and they are best read as expressions of unresolved grief rather than literal warnings.

There are older shapes in the folklore too — yokai, the broad family of Japanese spirits and uncanny beings said to inhabit wild and lonely places; and the restless dead of the ubasute legend, the abandoned who starved among the trees and stayed. But the yurei is the presiding spirit of Aokigahara, and it is worth resisting the urge to soften it into a campfire ghost. The yurei belief is a serious cultural account of what unresolved suffering does — the idea that a death heavy enough with feeling does not simply end, but leaves a residue in the place it happened, capable of touching whoever comes after. Hold onto that idea. The sceptics are about to explain it, and they will explain more of it than you might expect.

The Skeptics

Start with the compass, because it is the myth that gives all the others their license.

The compass story is often repeated as fact, but it is misleading. The basalt contains magnetite, and a compass placed directly against some rocks may deflect. Held at a normal reading height, however, it should still point north. The practical danger is terrain and visual monotony, not mystical interference; visitors should remain on marked trails and never assume that phones or GPS can substitute for that.

That does not make route-finding trivial. Aokigahara is genuinely disorienting: dense, repetitive woodland offers few landmarks, while exposed roots, cavities and uneven lava make off-trail travel hazardous. The forest does not need a magnetic anomaly to make a lost walker’s situation serious.

The silence yields in much the same way. Dense woodland, enclosed lava caves and an absence of distant views can make the landscape feel unusually muted. Folklore interprets that sensation as presence; a sceptical reading sees an environment and an expectation reinforcing one another.

Piece by piece, the science dismantles the supernatural forest and leaves the ordinary one standing. And the ordinary one is stranger, because everything the folklore attributed to spirits turns out to be true — the silence, the disorientation, the sense of a place that holds onto what enters it — just caused by rock and canopy rather than the restless dead. The sceptic’s victory here is total and also, oddly, hollow. It explains every mechanism and changes nothing about how the forest feels to stand in.

The remaining question is psychological rather than geological. A visitor who arrives knowing Aokigahara’s reputation is primed to interpret silence, green light and disorientation through that story. Expectation can shape perception without making the experience imaginary — and without requiring anything supernatural.

My Thoughts

I don’t believe Aokigahara is haunted. I think the yurei are a way of describing something true without a vocabulary for it, and I think the compass legend is folklore wearing a lab coat. The mechanisms are all accounted for. Nothing in the Sea of Trees requires a ghost.

And yet the question I can’t put down is the one the whole forest seems built to ask: does a place like this get inside you? Not through magnetism or spirits — through knowing. You walk in aware of what the forest is famous for. You feel the silence close over you and the light go green and the ground refuse your footing, and some part of you starts supplying the meaning the place is reputed to carry. The dread arrives, and it arrives on cue, and it is the most real thing you experience there. The folklore called that the dead reaching for the living. The sceptic calls it suggestion. But strip the argument between them and the same fact sits underneath both: this is a landscape where the story a person carries in can begin to act on them from the inside.

That is not a supernatural claim. It might be a more disquieting one. Because if a place can do that — if reputation and silence and disorientation can combine to press on a mind until it produces the very darkness the place is known for — then the reputation is not just a label attached to Aokigahara. It is a mechanism. Matsumoto’s novel and the books that followed didn’t only describe the Sea of Trees as a place people go to die. They may have helped make it one, by teaching each new arrival exactly what to feel the moment the quiet takes hold.

There’s a hard version of this that implicates more than a Japanese forest, and I’ll be honest that it implicates this series too. Every place The Dark Atlas visits, we arrive carrying its story, and the story shapes what we feel there — that is the entire premise of dark tourism, the reason a wood at the foot of Fuji draws visitors from other continents while ten thousand equally beautiful forests draw none. Mostly that transaction is harmless: we go somewhere with a reputation, and the reputation gives the visit its charge. But Aokigahara is the place where you can see the cost of it clearly, because here the reputation doesn’t just colour a nice day out. It may be an active ingredient in a real and continuing tragedy, and the people most exposed to it are not tourists at all.

So I keep landing on the same uncomfortable place. The forest is not evil, and it is not supernatural. It is a beautiful, silent, geologically extraordinary wood that has been given a story so powerful the story now does some of the forest’s reputed work for it. The Japanese authorities understood this well enough to stop saying the numbers out loud — to try to starve the reputation by refusing to feed it. They grasped the thing the ghost stories were groping toward all along: that at Aokigahara, what gets into people isn’t a spirit. It’s a story. And a story, unlike a ghost, is something we can choose to stop telling — or choose to tell more carefully. Which leaves the question I can’t answer, only hand to you: knowing that the telling is part of what makes the place dangerous, what does it mean that you came all this way to hear it, and that I chose to tell it anyway?

Visitor Information

Affiliate disclosure: The travel-planning links in this section are affiliate links. If you book through them, I may earn a commission at no extra cost to you.

Aokigahara lies at the northwestern base of Mount Fuji, in Yamanashi Prefecture, and is straightforward to reach from Tokyo. The simplest independent route is a train to Kawaguchiko Station — via the JR Chuo Line to Otsuki and the Fujikyu Railway, or a direct highway bus from Shinjuku, each around two hours — and then a local bus toward the Saiko area and the caves. By car it is roughly two hours on the Chuo Expressway. If you would rather see the wider Mount Fuji area on an organised day trip, you can compare Mount Fuji tours from Tokyo. For an overnight base close to the forest, compare places to stay in Fujikawaguchiko.

The forest is a legitimate and rewarding place to visit, and the way to visit it well is to treat it as a nature reserve on remarkable volcanic ground. Use only marked, publicly accessible trails; check current cave access and bus times before travelling; carry water; and wear sturdy footwear. The terrain becomes treacherous away from the paths, and Asian black bears live in the area. Local guidance should always take priority.

One further point belongs here, because the forest is not only a landscape. Aokigahara is a place where real people have died and continue to die, and where families and volunteers still walk the paths for reasons that have nothing to do with sightseeing. Go as a respectful visitor to an extraordinary forest. Do not go looking for evidence of the other thing, do not leave the trails in search of it, and do not photograph or publicise what is not yours to. The forest asks very little of the people who come to it. Ordinary courtesy covers almost all of it.

Sources

Books and Academic Works

Affiliate disclosure: Some book links below are Amazon affiliate links. As an Amazon Associate I earn from qualifying purchases, at no extra cost to you.

— Seicho Matsumoto, Nami no To (Tower of Waves), 1960 — the novel central to the forest’s modern reputation.

— Michael Dylan Foster, The Book of Yōkai: Mysterious Creatures of Japanese Folklore, expanded second edition (University of California Press, 2024) — for yūrei, yōkai and the cultural framework of Japanese spirits.

— Kirsten Cather, Scripting Suicide in Japan (University of California Press, 2024), chapter 4, “Aokigahara Jukai, Sea of Trees” — a detailed analysis of Matsumoto, later media and the limits of simple cause-and-effect claims.

Journalism and Long-form Reporting

— National Geographic, “Aokigahara: An Ethereal Forest” — photography and reporting on the Sea of Trees.

— The Washington Post and CNN reporting on Aokigahara, prevention efforts, and the decision to stop publishing figures.

— BBC Newsbeat — reporting on forest patrols and volunteer prevention work.

— HowStuffWorks, “Why is Japan’s Aokigahara Forest Called the ‘Suicide Forest’?” — including interview material with scholar John Nelson on Matsumoto and the literary lineage.

Official and Institutional Sources

— Japan National Tourism Organization, “Aokigahara Forest” and “Explore the Fuji Five Lakes” (japan.travel) — current official visitor, access, wildlife and trail guidance.

— World Health Organization, Preventing Suicide: A Resource for Media Professionals (2023 update) — guidance on avoiding sensationalism, method detail and harmful repetition while providing routes to help.

— Japan Meteorological Agency, Fujisan volcano catalogue; and Japan Tourism Agency, “Jōgan Eruption of 864” — formation of the Aokigahara lava flow and the Fuji Five Lakes landscape.

Further Reading

— Wataru Tsurumi, Kanzen Jisatsu Manyuaru (The Complete Manual of Suicide), 1993 — noted for its documented role in the forest’s later reputation; cited historically, not recommended.

— Material on ubasute in Japanese folklore and the scholarly debate over its historicity.

— For navigation and visitor safety, follow current Japan National Tourism Organization and local guidance; a compass, phone or GPS is not a reason to leave marked trails.

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This has been The Dark Atlas, Season 1 — the sixth of twenty of the world’s most compelling haunted places. The full historical record, the folklore and the science laid side by side, every source, and the complete visitor guide for Aokigahara are gathered in one place at shinstories.co.uk. If the Sea of Trees stayed with you, the companion episode on The Dark Atlas podcast takes a different way in — and there are five locations already waiting behind it, from a hillside in Lancashire to a hotel in the Colorado Rockies. Find all of it at shinstories.co.uk.