Tomogashima
island group in Wakayama, Japan
Tomogashima (友ヶ島) is a cluster of four islands in the Inland Sea, off Wakayama, Wakayama, Japan. The four islands are Jinoshima (地ノ島), Kamishima (神島), Okinoshima (沖ノ島), and Torajima (虎島). The islands form part of the Setonaikai National Park.
History
The islands were used by Buddhist monks for Shugendō. The folklore of the region holds that Ennogyoja, the founder of shugendo, underwent training on the steep cliffs of Tomogashima in the seventh to eighth centuries. This gave rise to the nickname of "The island of shugendo (mountain asceticism)" for Tomogashima. The first mound of the Katsuragi 28 Shuku is located on Torajima ("Tiger Island").
Later, during the Meiji period, a brick fort and lighthouse were built. Also during this time gun batteries and other defences, along with various support facilities, were constructed to counter foreign warships. Tomogashima was a critical component of the Shusei Kokubō (守勢国防 - i.e.
The public source identifies “Tomogashima” as island group in Wakayama, Japan. This brief keeps that definition visible, then builds a research path around Tomogashima, island and group.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Tomogashima”, the useful work is to connect “island group in Wakayama, 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 Aug 2, 2026. The linked authority identifier is Q7820112. Authority coordinates are 34.295, 135.024. None of the 1 selected statements returned an explicit reference.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. 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.
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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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This entry incorporates text from “Tomogashima” 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.