The new island is C-shaped, with a diameter of approximately 1 kilometer. It was discovered after the volcano some 50 km south of Iwoto in the Ogasawara Islands in the Pacific Ocean started erupting a few days ago.
New islands have been confirmed in the area in 1904, 1914, and 1986, with all of them having submerged due to erosion by waves and currents.
The one found in 1986 sank after about two months, according to the coast guard.
As the submarine volcano is located near Minami Iwoto Island, the southernmost islet in the island chain, any new island in the area could be added to Japan's territory.
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