It is legally part of Tokyo. It is a two-hour flight, a coin-flip helicopter and a genuine act of faith away from Tokyo. And the whole village sits inside the wall of a volcano that erupted the island empty in 1785.
The helicopter seats nine, and you got the seat because you booked it exactly one month ago, to the day, the moment the reservation window opened. Below you, Hachijōjima's runway shrinks, the sea turns the colour of a bruise, and then a green ring rises out of the water with a smaller green ring sitting inside it, like the island is nested inside itself.
You land, you clear the tunnel blasted through the outer crater wall, and the road opens out into a bowl: pasture, a scatter of roofs, a school, and off to one side a patch of ground with steam quietly leaking out of it, the way it might leak out of a manhole cover, except this manhole cover is the entire hillside.
Someone is standing at the steam vent with a net bag of eggs and a stopwatch. Nobody around her finds this remarkable in the slightest.
Aogashima is the southernmost inhabited point of the Izu Islands and, on paper, a village of Tokyo Metropolis — the same administrative city as Shibuya Crossing, 358 km further north. Geologically it is a double caldera, a shape rare enough worldwide that volcanologists come here specifically to look at it: an outer ring called Otonbu rising to 423 metres, and inside that, a second, younger crater called Maruyama standing 223 metres tall in the middle of the bowl. Almost the entire resident population — officially a little over 170 people — lives on the inner slope of the outer wall, which makes the popular description technically fair: this is a village built inside a volcano, not near one.
The island has done this before and paid for it. In 1785 Aogashima erupted seriously enough that ash and pyroclastic material killed roughly a third of everyone living there, and the survivors evacuated to Hachijōjima, the larger island 65 km north. What followed was not a quick resettlement. Accounts differ on the exact timeline, but the broad shape is agreed: it took decades, not years, before the population fully returned — a return effort commonly credited to an islander named Jirōdayū Saura, who led people back in the 1830s, roughly half a century after they left. Some sources put the full recovery of the population at close to fifty years. Either way, this is a community that chose, generation after generation, to keep living on top of the thing that had already tried to kill their grandparents.
What makes the choice make sense today is the same heat that did the killing. Steam still rises constantly from vents the islanders call hingya, and rather than fence it off, the village built infrastructure around it: a public sauna heated entirely by geothermal steam, and beside it a communal steam-cooking hut where anyone can lower a net of eggs, sweet potatoes or fish into the vent and pull out lunch twenty minutes later, salted lightly and cooked by the volcano itself. Since 1999 the village has also run its own salt works at the site, letting seawater slowly crystallise in pans heated by hingya steam — Hingya salt is now sought out by chefs on the mainland specifically because of how it is made. The island's other signature product, a fiercely strong sweet-potato shōchū called Aochu, is brewed in such small volume that almost none of it leaves the island; ordering it in the island's one bar is close to the only way to try it.
None of this is easy to get to, and that is not incidental colour, it is the actual condition of visiting. From Tokyo you first fly or ferry to Hachijōjima, and from there you have exactly two ways onward: a 20-minute flight on a nine-seat helicopter booked a month ahead through a lottery-style reservation system, or a roughly three-hour crossing on the ferry Aogashima-maru, which by the operator's own figures completes only about half to sixty percent of its scheduled sailings — cancelled by swell, cancelled by wind, cancelled by the fact that Sampo Port has no proper harbour and boats are lifted in and out of the water by crane. People plan a two-night stay and sometimes get a five-night stay, unwillingly, because nothing is leaving until the sea allows it.
That unpredictability is precisely why so few outsiders ever see the place, and precisely why the village has stayed the size and shape it has: one shop, one school, one bar, one road looping the crater floor, no chain of anything, no queue for anything, because nobody arrives who was not already prepared to be stuck.
The instinct is to read Aogashima as a story about people who refused to be scared off by a volcano. That undersells it. The volcano is not something the village survives despite — it is what the village runs on. The steam that once buried the island now cooks its food, heats its bathhouse, and cures the salt it sells to restaurants in Tokyo. The same vents, the same heat, the same mountain. It did not stop trying to kill the island. The island just found a use for it.
- Aogashima is a rare double caldera: the outer rim, Otonbu, reaches 423 m; the younger inner cone, Maruyama, rises 223 m from the crater floor where most of the village sits.
- The 1785 eruption killed roughly a third of the island's population; supposedly it took close to fifty years, and a resettlement effort led by Jirōdayū Saura in the 1830s, before the island was fully repopulated.
- The Aogashima-maru ferry completes only around 50–60% of its scheduled sailings, and the helicopter to Hachijōjima carries just nine passengers per flight — booked a month ahead, with no guarantee of a seat.
Getting there
Fly Tokyo Haneda to Hachijōjima (about 55 minutes) or take the overnight ferry (roughly 10 hours). From Hachijōjima, book the Tokyo Island Shuttle helicopter to Aogashima (20 minutes, 9 seats, reservations open exactly one month before travel) or the Aogashima-maru ferry (about 2.5–3 hours, when it runs). Build at least one spare day into the trip on both ends — this is not a reliable day trip from Tokyo.