Why does Sakurajima has the word jima, meaning of island even though it is not an island?


Sakurajima is now part of Osumi peninsula, but it was an island until the Taisho eruption in 1914.

It was 330-400m width, and 70-80m depth between Sakurajima and Osumi peninsula.
The Taisho eruption filled the gap between them with lava.


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