Overview
Izu Ōshima is the largest of Japan's seven Izu Islands, dominated by active Mt. Mihara volcano that last erupted in 1986.
Beach · Cycling · Island · Nature · Trekking
Before you go
Connectivity
No specific SIM or WiFi details in article. Standard Japanese mobile coverage applies.
Money
Post office ATM in Motomachi near ferry port accepts international cards, open weekdays 09:00-18:00, weekends 09:00-14:00. Cash preferred outside main towns.
Safety
Poisonous snakes on forest trails; volcano shelters positioned island-wide; overdue Great Tokai Earthquake epicenter directly beneath island.
Transport
Jetfoil from Tokyo Takeshiba Sanbashi Pier takes 1h45m (¥5,700); overnight ferry ¥3,500 takes 6-8h. Bus connects ferry ports to Mt. Mihara. Taxi Okata-Motomachi ~¥2,400.
Weather
Summer crossings 6h vs winter 8h. High wind/rain may close outdoor onsen—announced via island loudspeakers.
