Aogashima 2027: Tokyo's Volcano-Within-a-Volcano Island

Aogashima is 9 km² of Pacific caldera, ~170 residents, no bridges, no tunnels — only a weather-dependent helicopter from Hachijojima and an infamous 3-hour ferry.

Quick facts: Aogashima 2027

Why Aogashima

Aogashima is the most remote inhabited place in Tokyo prefecture and one of the strangest places in Japan: a volcano inside a volcano, where the inner cone rises inside the outer caldera's bowl, both of them green with tree ferns and pines. The village sits on the north rim; the inner caldera holds a geothermal sauna that cooks eggs in jet-steam vents. Fewer than 200 permanent residents live here, and most visitors stay in one of the handful of minshuku. Expect zero convenience stores, two restaurants, no ATMs that take foreign cards, and spectacular night skies.

• ●Inner caldera (Maruyama) — walk down into the second volcanic cone
• ●Fureai Sauna — geothermal steam sauna, ¥300
• ●Jiyonie Lookout — classic double-caldera photo
• ●Shio no michi — salt made from caldera steam
• ●Jiheizan Shrine — the island's main shrine on the rim
• ●Stargazing — Bortle 1 skies, no light pollution

Getting there

• ●From Tokyo to Hachijojima: fly ANA from Haneda (~55 min) OR Tokai Kisen overnight ferry
• ●From Hachijojima: Toho Air Service helicopter ~20 min, book 1 month before to the day
• ●From Hachijojima: Izu Islands ferry ~3 hrs, ~4x per week, cancels often
• ●On-island transport: walk; one road loops the rim; some minshuku lend cars
• ●Return the way you came — be flexible on exit day

What to do (2-day plan)

Bookable experiences

• ●Minshuku stay with island cooking (very limited beds)
• ●Hachijojima side trip — Nakanogo Onsen, Mihara-yama hike
• ●Toho Air helicopter booking (phone, 1 month exactly to the day)
• ●Night-sky stargazing tour with an island guide (occasional)

FAQ

• ●Is Aogashima dangerous to visit? No active eruption since 1785, but it is designated Level 1 (potential for eruption). Monitor JMA alerts.
• ●Can I book the helicopter online? No — Toho Air phone-only, 30 days before departure.
• ●What if the ferry cancels? Try the helicopter, or add a buffer day on Hachijojima and go the next morning.
• ●ATMs? Only the post office — bring enough yen in advance.
• ●Food? Two small restaurants + minshuku meals. Pack snacks.
• ●Mobile signal? Yes, surprisingly good — carriers all cover the rim.
• ●Can I do day trips to Aogashima? Technically no — flight schedules make it one-way-per-day.
• ●Best time of year? May-June and October are driest. Avoid typhoon window August-September.
• ●Can I visit the inner caldera alone? Yes — a paved road runs down from the rim.
• ●Any English spoken? Minimal. A translation app and some basic Japanese politeness go a long way.