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Izu Oshima

Volcanic shore dives, seasonal hammerhead encounters and island trails near Tokyo.

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Destination Guide Sources For Izu Oshima

Reference links used to build and maintain this guide.

28 sources • Updated Nov 3, 2026

Written by DiveJourney. Built from public sources and local operator knowledge. Last updated Nov 3, 2026.

Oshima Diving Liaison Council: live rules and operator coordination - Membership, local rules, self-guided restrictions, site-rule entry point; check on travel day.
Oshima Diving Liaison Council: local diving rules PDF - Actual equipment, stewardship, surface restrictions; baseline PDF contains updates, so confirm later site notices.
Oshima Diving Liaison Council: four diving seasons - Local water temperature and visibility seasonal guidance; older qualitative estimate, not a forecast.
Oshima Diving Council: Keikai early morning participation rules - Minimum 30 logged dives, arrival-day exclusion, medical certificate contingencies, declaration.
Japan National Tourism Organization: Tokyo scuba diving - Official tourism overview of Akinohama and volcanic shore access; its shore-only claim is not current for all operators.
SeaSound Izu Oshima dive site descriptions - Local operator listing of Akinohama, Nodahama, Keikai, O-no-hama, Toshiki, Yaiso and Kagene boat sites.
Uminowa Izu Oshima diving site descriptions - Local operator site and site selection; no route or access guaranteed.
Uminowa guided diving, boat options and rates (updated September 2026) - 2026 operator offer, guide fees, rental exclusions, and northern pickup limits.
Orange Fish: skin-diving program (June 2026) - Explicit beginner skin-diving supply, seasonal window, depth limit, prerequisites, pricing and transfer limits.
Uminowa instructor-led snorkeling (updated September 2026) - Explicit operator-guided snorkel service and itemized fees.
Oshima Tourism Association: things to do - Mount Mihara, Ura Sabaku, stratified cliffs, Palm Line, geothermal baths, town attractions.
Oshima Tourism Association: island transport - Rental car, island bus, taxi and cycle options; logistics vary by port and day.
Oshima Town: Toshiki campsite (updated April 2026) - Free campsite, mandatory prior reservation, transit and nearby Toshiki swimming area.
Tokai Kisen: official vessel timetables - Current and changeable high-speed jetfoil and passenger vessel route schedules.
Tokyo Island Access: Oshima transport operation status - Official day-of-service routes, island port assignment, cancellations and flight status.
New Central Airservice: Chofu to Oshima flight schedule - Currently listed local air connection, fares, and operator schedule, subject to change.
Go Tokyo: transport to Tokyo islands - Tokyo metropolitan tourism cross-check on Takeshiba ferry services and transfer time.
Japan Meteorological Agency: Oshima monthly climate normals - Observed long-term monthly rain and air temperature means; October has high rainfall.
Japan Meteorological Agency: Izu Oshima volcano warning level - Level 1 volcano forecast and prohibition on entering hazardous crater interior.
Japan Ministry of Health: Oshima Medical Center listing - Motomachi medical facility, verified daytime contact and scheduled outpatient hours.
DAN Japan: emergency medical services - Emergency response priorities, member-only dive incident hotline and recompression referral.
Japan Coast Guard: maritime emergency 118 - Official coastal maritime distress telephone number.
Japan Ministry of Foreign Affairs: visa-exempt short-term entry - Nationality-specific visa exemption; general Japan immigration rules apply.
JNTO: Japanese electrical outlet and mains - 100V power, 50 Hz in eastern Japan, commonly type A sockets.
Go Tokyo: Izu Oshima Camellia Festival - Seasonal late-winter camellia festival and variable annual dates.
Oshima Tourism Association: Gojinka Onsen - Motomachi area public hot-spring facilities and current guidance.
Divers Alert Network: flying after scuba diving - Conservative no-fly guidance and risk distinctions; not a guarantee.
Destination hero photo by Guilhem Vellut - Yuno-hama beach @ Motomachi @ Oshima (9609621147). CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/). Cropped and resized for the cover.