History of Niijima Island and Shikinejima Island

Based on the ruins discovered in Honson and Wakagou on Niijima Island and in Fukinoe and Isjirogawa on Shikinejima Island, it is believed that people have lived on Niijima Island and Shikinejima Island since the Jomon period (14,000-300 BCE). Since ancient times, these islands were very much shaped by nature. In 886, Mt. Mukai erupted, and the islands were covered entirely in white volcanic ash. In 1703, a huge tsunami struck. According to theory, this tsunami caused Niijima Island and Shikinejima Island, which had been a single island until that point, to split. In the Edo period (1603-1868 CE), these islands were a penal colony, and many people were sent to Niijima Island for religious or political reasons. Some of those people contributed to the improvement of the island's culture, healthcare, and lifestyle.
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https://www.niijima.com/shoukai/（外部サイト）

http://shikinejima.tokyo/learn/history/（外部サイト）