Izu Oshima Travel Guide

Izu Oshima is the largest and most accessible island in the Izu Island chain, sitting roughly 120 km south of central Tokyo in the Philippine Sea. Administratively part of the Tokyo Metropolis — not Shizuoka Prefecture, as visitors sometimes assume — the island has a population of roughly 7,000 to 8,000 people and a decidedly unhurried pace of life.

The island is dominated by Mount Mihara (Mihara-yama), a 764-metre active stratovolcano whose most recent significant eruption occurred in 1986, forcing a full evacuation. Today the caldera is a major hiking destination, and a paved road and trail system allow visitors to walk the rim and look directly into the volcanic crater on clear days.

Beyond the volcano, Oshima is celebrated for its vast camellia (tsubaki) forests — an estimated 3 million wild camellia trees blanket the island's slopes — and for the unique black volcanic sand of its beaches. It offers a genuine island escape that, because of the ferry connection, feels far more remote than its proximity to Tokyo suggests.

The island retains strong local traditions, including the Awa-odori dance heritage and a distinctive dialect. Tourism is relatively low-key by Japanese standards, meaning crowds are modest outside the camellia festival season and public holidays.

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 website of the Japan Immigration Services Agency.

When to Visit

• Late January–mid February: Peak camellia bloom and the Tsubaki Matsuri (Camellia Festival). Crowds are higher than average for the island, so book accommodation and ferries early.
• Spring (April–May) and Autumn (October–November): Mild temperatures ideal for hiking Mount Mihara and cycling.
• Summer (July–August): Beach season; warm but humid. Jellyfish can be present in some areas — verify conditions locally.
• Winter (December–January, outside festival): Quiet, occasionally cold and windy; some facilities may reduce hours.

What to Pack

• Sturdy walking or hiking shoes if you plan to climb Mount Mihara
• Layers — summit temperatures can be significantly cooler than sea level
• Cash, as card acceptance on smaller islands can be limited; verify with your accommodation in advance
• A basic Japanese phrasebook or translation app; English signage exists at major tourist sites but is not universal

Ferry from Tokyo (Takeshiba Pier)

The primary way to reach Oshima is by large ferry from Takeshiba Pier in central Tokyo, operated by Tokai Kisen. There are overnight and high-speed jet-foil services; travel times and schedules vary by season and vessel type. Verify current schedules and book tickets in advance, particularly around the camellia festival, on Tokai Kisen's official website.

Ferry from Atami and Ito

Smaller ferries also connect Oshima with Atami and Ito on the Izu Peninsula (Shizuoka Prefecture), offering a shorter crossing that pairs well with a broader Izu region itinerary. Schedules depend heavily on the season — confirm locally or through Tokai Kisen before planning.

Helicopter

A helicopter service operates between Tokyo (Chofu Airport) and Oshima Airport, reducing travel time dramatically. Seats are limited; book well in advance and check current operator details and schedules, as these can change.

Arriving by Air

Oshima Airport has a paved runway and scheduled domestic service. Check with ANA or other operators for any current direct routes from Haneda or other Tokyo-area airports; service frequency has varied historically.

Note: All ferry services can be delayed or cancelled due to weather, particularly in the typhoon season (late summer) and winter storms. Build flexibility into your itinerary.

Oshima is manageable by a combination of bus, rental bicycle, and rental car or scooter. The island's main road loops around the coast, making orientation relatively straightforward.

Local Bus

Oshima Koun operates bus routes connecting the ferry piers (Okada Port in the north and Motomachi Port on the west coast) to the island's main sights including the volcano access road. Schedules can be infrequent — pick up a timetable at the port or tourism office on arrival.

Rental Bicycle and E-Bike

Cycling is a popular way to explore. The coastal loop road is largely flat, though routes toward Mount Mihara involve significant elevation gain. Rental shops are available near the main ports; verify availability ahead of peak season.

Rental Car and Scooter

Car and scooter rentals give the most flexibility, especially for reaching remote beaches and trailheads. A Japanese or international driving licence is required. Confirm rental availability and rates locally.

Walking

Motomachi, the main town, and key areas around the ferry piers are walkable. Long-distance hiking trails, particularly around the Mount Mihara caldera rim, are well-marked but require appropriate footwear.

Accommodation on Oshima is dominated by minshuku (family-run guesthouses) and small ryokan (traditional inns), with a limited number of hotels. Most are concentrated in Motomachi, with some guesthouses in other coastal villages.

Half-board plans are common and practical — dinner and breakfast at your guesthouse reduces logistical pressure on an island with limited dining hours. Hosts at minshuku are often a good source of local knowledge and tips on trail conditions.

Book well in advance for the camellia festival period (late January–February) and summer weekends, when the island sees its highest visitor numbers relative to capacity. For a quieter experience, spring and autumn weekday stays are ideal.

Camping is available at designated sites; verify current open sites and facilities with the Oshima tourism office before planning a camping trip.

Tip: A number of guesthouses are Japanese-only in their communication; if you have limited Japanese language ability, consider booking through a platform that offers English-language support or contacting Oshima's tourism office for assistance.

Mount Mihara (Mihara-yama)

Hiking to the caldera rim of the active volcano is the island's signature experience. A road leads partway up, and a well-maintained trail circles the crater rim. On clear days views extend across the surrounding ocean and to neighbouring islands. Check current volcanic activity advisories from the Japan Meteorological Agency before visiting — access restrictions can change depending on alert levels.

Oshima Park and Camellia Forests

Oshima Park in the north of the island contains one of the largest concentrations of camellia trees in Japan, alongside a small zoo and botanical areas. The entire island's interior is threaded with camellia-lined paths best explored on foot or by bicycle.

Black Sand Beaches

The island's volcanic geology produces distinctive dark sand beaches. Habu Beach and beaches near Motomachi are among the most visited, though conditions and facilities vary — check locally for swimming suitability.

Oshima Volcano Museum (Oshima-machi Volcano Museum)

This small museum near the volcano documents the island's volcanic history, including the 1986 eruption and evacuation. It provides useful geological context before or after hiking Mihara-yama. Verify current opening hours and admission fees on-site or through the Oshima tourism office.

Cycling the Coastal Route

The roughly 50 km road circling the island makes for a rewarding full-day cycling trip with ocean views, camellia groves, lava fields, and coastal rock formations. Pace yourself — the terrain has gentle undulations and the sun exposure can be significant in summer.

Cultural and Local Events

The Tsubaki Matsuri in late January and February includes parade events and traditional performances. The island also celebrates local festivals tied to the Shinto shrine calendar; timing varies by year.

Oshima's food culture is rooted in the sea and in simple, seasonal ingredients. Fresh fish and shellfish landed at the island's ports appear on most restaurant menus and at local markets.

What to Try

• Kusaya: A pungent fermented dried fish that is an Izu Islands speciality. It has a famously strong aroma but a flavour appreciated by those who seek it out; try it at least once for the cultural experience.
• Sazae (turban shell): Grilled over charcoal with butter and soy sauce, sazae is found at seafood stalls and izakayas across the island.
• Fresh sashimi: Locally caught fish served at guesthouses (minshuku) and restaurants; quality is generally high given the proximity to fishing grounds.
• Tsubaki oil products: Camellia oil is used locally in some traditional cooking preparations and sold as a condiment and beauty product.

Where to Eat

Most dining options are concentrated in Motomachi. Many guesthouses (minshuku and ryokan) offer half-board (breakfast and dinner) plans, which is often the most practical and enjoyable way to eat on the island given limited restaurant variety late at night. Confirm meal plans when booking.

Drinks

Convenience stores (there are a small number on the island) and vending machines stock the usual Japanese drinks. Local bars and izakayas serve standard Japanese beer, sake, and shochu.

Money

Cash remains important on Oshima. While some larger establishments accept credit cards, many minshuku, smaller restaurants, and local shops are cash-only. Withdraw sufficient yen before leaving the mainland or at ATMs at Japan Post offices on the island (verify availability locally).

Connectivity

Major Japanese mobile carriers provide coverage in the main areas of the island. Remote hiking routes may have patchy signal. Portable Wi-Fi devices rented in Tokyo and brought along are a reliable option.

Emergency Numbers

• Police: 110
• Fire and Ambulance: 119
• These are standard Japan-wide numbers.

Tourist Information

The Oshima Tourism Association maintains an office that can provide maps, accommodation listings, and event schedules. Verify current contact details and hours on arrival or through online searches before travel.

Typhoons

Oshima sits in a region susceptible to typhoons, typically July through October. Monitor Japan Meteorological Agency forecasts if travelling in this period; ferry and helicopter services are suspended during and around typhoons.

Volcanic Activity

Mount Mihara is an active volcano. Check the Japan Meteorological Agency's volcanic alert level for Mihara-yama before hiking. Restrictions are rare in normal periods but do occur.

Oshima is a generally very safe destination by any measure. Violent crime is extremely rare. Standard Japan-wide common-sense precautions apply.

The main safety considerations are environmental. Hiking Mount Mihara should be done with attention to current volcanic alert levels (check the Japan Meteorological Agency website), appropriate footwear, and weather awareness — the summit area can be windy and cold even when the coast is warm. Tell your guesthouse host your hiking plans.

Swimming in the ocean carries rip current risks at some beaches; look for designated swimming areas and observe any posted flags or local advice. The sea around the island can be rough outside of summer calm periods.

In the event of an earthquake or tsunami warning — Japan's early warning systems are reliable — follow instructions broadcast on public address systems and move to higher ground immediately if a tsunami advisory is issued.