Hachijō-jima
island in Tokyo, Japan
Hachijō-jima (Japanese: 八丈島) is a volcanic island of Japan in the Pacific Ocean. It is about 287 km (178 mi) south of the special wards of Tokyo. It is part of the Izu archipelago and within the Fuji-Hakone-Izu National Park. Its only municipality is Hachijō. On 1 March 2018, its population was 7,522 people living on 63 km2. Some inhabitants speak Hachijō language, which is considered an endangered language and the number of speakers is unknown. The island has been inhabited since the Jōmon period, and was used as a place of exile during the Edo period. In modern times, it has been used for farming sugarcane and housing a secret submarine base during World War II; it is now a tourist destination within Japan.
Hachijō-jima receives about 3,000 mm (120 in) of precipitation annually. With a humid subtropical climate, and an average high temperature of 21 °C (70 °F), the island and the surrounding ocean support a wide variety of sea life, birds, mammals, plants, and other life.
The public source identifies “Hachijō-jima” as island in Tokyo, Japan. This brief keeps that definition visible, then builds a research path around Hachijō-jima, island and Tokyo.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Hachijō-jima”, the useful work is to connect “island in Tokyo, Japan” to the records capable of establishing context and consequence.
The strongest evidence will usually combine a dated visual record with documents produced by the authority responsible for the place. The source revision retrieved here is dated Sep 13, 2026. The linked authority identifier is Q1191120. VIAF identifies the subject as 255882321. Authority coordinates are 33.109, 139.791. 1 of 2 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 2018.
Architectural summaries often privilege surviving fabric and can understate demolished phases, contested use or displaced communities. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
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Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
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Questions for further research
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This entry incorporates text from “Hachijō-jima” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.