Oshima, Tokyo / 三原山（伊豆大島）

Mt. Mihara, Izu Oshima

The active volcano at the centre of Izu Oshima, which last erupted in 1986; walk among black lava flows, peer into the crater, and see the Ura-sabaku desert that looks like another planet.

The dark lava-streaked slopes of Mt Mihara above a wide plain of low shrubs, with a fenced path in front — Mt Mihara on Izu Oshima (photo taken March 2016)Photo: Kentaro Ohno / Wikimedia Commons, CC BY 2.0 (resized) · License · Source

Last official check

26 Sept 2026

Traveler reports

Reports open in Phase 2

Next scheduled check

25 Dec 2026

Decide before you go

A short summary made from the official facts below. Check the rows for details.

Getting there: Bus

Before you go

Only facts we confirmed on official sources are shown. Anything else is marked “Not checked yet”.

Opening hours: Not checked yet — we have not confirmed this on an official source yet. Check with the spot before you go.
Closed: Not checked yet — we have not confirmed this on an official source yet. Check with the spot before you go.
Admission: Not checked yet — we have not confirmed this on an official source yet. Check with the spot before you go.
Getting there: In high season buses run regularly from the port to the trailhead; in quieter periods a rental car is recommended.
Checked 26 Sept 2026 on the official site
Parking: Not checked yet — we have not confirmed this on an official source yet. Check with the spot before you go.
Payment: Not checked yet — we have not confirmed this on an official source yet. Check with the spot before you go.
Accessibility: Not checked yet — we have not confirmed this on an official source yet. Check with the spot before you go.

Found wrong or outdated information? Let us know

Address: Oshima, Tokyo (Japanese address: 東京都大島町野増)

Official site: https://www.town.oshima.tokyo.jp/soshiki/kankou/mt-mihara.html

Location

We have not confirmed the location on an official source yet, so there is no map.

Crowds

Crowd level: Not checked yet — no official source yet, and not enough traveler reports.
Best time to visit: Not checked yet — no official source yet, and not enough traveler reports.
Peak time: Not checked yet — no official source yet, and not enough traveler reports.
Busiest days: Not checked yet — no official source yet, and not enough traveler reports.
Busiest season: Not checked yet — no official source yet, and not enough traveler reports.
Latest traveler report: None yet

Traveler crowd data by time of day appears after 5 traveler reports (0 so far).

You can check typical busy hours in Google Maps ("Popular times" on the place's page). Open this spot in Google Maps

Visiting respectfully

Local etiquetteThe hike from Mihara-yama Onsen takes about 1 hour; with more time you can circle the caldera.Checked 26 Sept 2026 on the official site

Verification log

26 Sept 2026First check · Tourism board · https://www.gotokyo.org/jp/spot/253/index.htmlHours, access and description read from a tourism organization's site.