Oshima Ōshima, Volcanic island in Matsumae, Japan.
Oshima Ōshima is a volcanic island in the Sea of Japan off the coast of Matsumae. It features two overlapping stratovolcanoes whose peaks rise approximately 737 meters above sea level.
The island was formed through volcanic activity over many centuries, with the most significant recorded eruption occurring in 1741. This eruption created a horseshoe-shaped caldera and generated a tsunami that affected nearby coastal areas.
The lighthouse at Aidomari stands as a maritime navigation point, operated by the Japan Coast Guard to ensure safe passage in the Sea of Japan.
Access to the island is restricted and requires special permits due to its protected status and ongoing volcanic monitoring. Visitors should contact the relevant authorities to learn about current access conditions.
The island holds the distinction of being Japan's largest uninhabited territory, spanning 9.73 square kilometers in the Sea of Japan.
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