Izu Oshima Travel Guide

Izu Oshima is the largest island in the Izu archipelago, situated roughly 120 km south of central Tokyo in the Philippine Sea. Despite its proximity to one of the world's most densely populated cities, the island has a distinctly rural, unhurried character defined by volcanic terrain, fishing culture, and a strong folk identity.

The island's dominant feature is Mt. Mihara (Mihara-yama), an active stratovolcano that last erupted in 1986. The caldera rim is accessible on foot and offers one of the more dramatic landscapes in the greater Tokyo region. Black sand and gravel beaches ring much of the coastline, and the interior is laced with hiking trails through lava fields and forest.

Izu Oshima is administered as part of Tokyo Metropolis — a fact that surprises many first-time visitors. Despite that administrative connection, it feels nothing like the capital, making it a genuine escape rather than just a day trip destination.

Visas

Izu Oshima is part of Japan and subject to standard Japanese entry requirements. For visa information specific to your nationality, check TravelerPulse's Visas section and the official Japan Immigration Services Agency website.

When to visit

• January–February: Camellia trees bloom across the island; the Tsubaki (camellia) Festival draws visitors from the mainland.
• Late spring and autumn: Comfortable temperatures for hiking and outdoor exploration.
• Summer: Warm and humid; snorkeling and diving are popular, but typhoon risk increases from late summer.
• Winter outside camellia season: Quiet and cooler; some accommodation and eateries reduce hours or close.

Health and practicalities

No special vaccinations are required beyond what is standard for Japan. Pharmacies on the island are limited compared to the mainland; bring an adequate supply of any prescription medication. Mobile coverage from major Japanese carriers is generally available but can be patchy on remote trails.

By high-speed ferry

High-speed jet ferries operate from Takeshiba Pier in central Tokyo (near Hamamatsucho) and from Atami on the Izu Peninsula. Journey times vary — the high-speed service from Tokyo takes roughly 1 hour 45 minutes, while conventional overnight ferries take significantly longer. Schedules and fares change seasonally; verify current timetables with Tokai Kisen, the primary operator, before booking.

By overnight ferry

An overnight ferry from Tokyo is a practical option, especially for travelers bringing bicycles or large luggage. The slower crossing allows you to arrive rested and make use of an additional day. Cabins range from open tatami areas to small private rooms; verify availability and book in advance during peak periods.

By air

New Central Airservice operates small propeller aircraft between Chofu Airport (western Tokyo) and Oshima Airport. Flight time is short — under 30 minutes — but flights are subject to weather cancellations. Verify schedules and book in advance, particularly during camellia season.

Arrival points

The island has two main ferry ports — Motomachi and Okada — and services alternate between them depending on weather and wind direction. Confirm which port your vessel will use on the day of travel.

Izu Oshima is served by a bus network that circles the island and connects major sights, but service frequency is limited, particularly in the evenings and on less-traveled routes. Check local timetables on arrival.

Renting a bicycle or scooter is a popular and practical option for independent exploration. Rental shops are located near both ferry ports; verify availability during busy periods. The island's main road follows the coast and is manageable on a bicycle, though the interior roads toward Mt. Mihara involve significant elevation gain.

Taxis are available but relatively scarce. Some accommodation providers offer pickup from the ferry port — confirm this when booking. Self-drive car rental is available on the island; an International Driving Permit is required for most foreign license holders renting in Japan.

Mt. Mihara (Mihara-yama)

The hike to the caldera rim is the island's signature experience. A trail runs from the Oshima Onsen Hotel area (accessible by bus) to the crater's edge. The landscape alternates between barren lava fields and patches of wind-sculpted vegetation. The caldera itself is an active vent; stay on marked paths and observe any current access restrictions posted by local authorities.

Oshima Park and Camellia Forest

Oshima Park in the north of the island contains one of Japan's largest camellia groves — over 500 varieties. It is most impressive during the January–February bloom. The park also houses a small zoo and botanical areas. Verify current admission fees and opening hours on site or with local tourism offices.

Beaches and coastline

Akasaki Coast and Habu Port area offer distinctive black volcanic beaches and clear water. Swimming conditions and designated swimming areas change seasonally; look for local signage or ask at your accommodation before entering the sea.

Oshima Onsen Hotel area

Several hot spring (onsen) facilities use geothermal water heated by Mt. Mihara's volcanic activity. Day-use bathing is available at some facilities; confirm hours and fees locally.

Cycling the island perimeter

A circumnavigation of the island by bicycle is achievable in a full day for reasonably fit cyclists. The coastal road passes fishing hamlets, lava outcrops, and sea views that are difficult to access any other way.

Izu Oshima's cuisine reflects its maritime and agricultural setting. Fresh fish and shellfish dominate menus — sashimi platters featuring locally caught species are widely available at restaurants near the ports and in Motomachi, the main town.

Kusaya is the island's most distinctive — and polarizing — local specialty: a strongly fermented dried fish with a pungent aroma that is mellowed during cooking. It is considered a local delicacy and pairs traditionally with shochu (distilled spirit). Visitors should approach it with curiosity rather than expectation.

The island also produces its own camellia oil (tsubaki oil), used in cooking and as a condiment. Look for locally made tsubaki oil dressings and products at restaurants and small shops. Dairy products from island-raised cattle also appear on some menus.

Dining options are concentrated in Motomachi. Outside the main town, options become sparse, particularly in the evening — plan meals accordingly and consider asking your accommodation about meal service if you are staying in a rural area.

Shopping on Izu Oshima is modest in scale and focused on local products. The most meaningful purchases tend to be edible or functional rather than decorative.

• Tsubaki (camellia) oil: Pressed from island-grown camellia seeds, used for cooking, hair care, and skin care. Available in various grades and bottle sizes at shops in Motomachi and near tourist sites.
• Kusaya: Packaged dried fish products are sold at souvenir shops; note that strong-smelling foods may not be permitted on some ferry or aircraft cabins — check before buying.
• Oshima silk textiles (Oshima Tsumugi): Note that Oshima Tsumugi is primarily associated with Amami Oshima in Kagoshima Prefecture — a different island entirely. Avoid purchasing items on Izu Oshima labeled as authentic Amami Tsumugi without verification.
• Local ceramics and folk craft items are occasionally available at small galleries and craft shops in Motomachi.

Money

Japan remains largely cash-dependent outside major cities. ATMs at Japan Post offices and some convenience stores accept international cards; verify availability on the island before relying solely on card payments. Carry sufficient yen for your stay.

Connectivity

Public Wi-Fi is available at some accommodation providers and ferry terminals. Mobile data from major Japanese carriers (and roaming agreements) generally works across most of the island, with weaker signals on remote trails.

Emergency numbers

• Police: 110
• Fire and ambulance: 119
• These are Japan-wide numbers and apply on Izu Oshima.

Typhoons

The island lies in a typhoon corridor. From late summer through autumn, monitor Japan Meteorological Agency forecasts. Ferry and flight services are suspended during severe weather, which can strand travelers for multiple days. Build schedule flexibility into trips planned during this period.

Language

English is not widely spoken outside tourist-facing facilities. A translation app and basic Japanese courtesies will be useful. Tourist information is available at the port and in Motomachi; some staff speak limited English.

Izu Oshima is a generally safe destination. The primary environmental risks are volcanic and meteorological rather than related to crime.

Mt. Mihara is an active volcano with a recorded eruption history. Volcanic alert levels are monitored by the Japan Meteorological Agency; check current levels before hiking toward the caldera. Trail access may be restricted without notice during periods of increased activity.

Sea conditions around the island can change quickly. Observe posted swimming advisories and exercise caution near rocky coastal areas. Rip currents can occur at certain beach locations.

Hiking trails on lava fields can be disorienting; carry a downloaded offline map and inform your accommodation of your planned route if hiking solo.