Numazawa (volcano)
lake in Japan
Numazawa is a caldera and lake in Ōnuma District of Fukushima Prefecture, Japan. The caldera measures 2 km (1.2 mi) across and the lake that occupies it measures 96 m (315 ft) deep. The volcanic caldera was constructed within the older and larger Uwaigusa caldera which is 4.2 to 4.0 million years old. The volcano first erupted 110,000 years before present (BP) produced pyroclastics. At 71,000 BP, the Mukuresawa lava dome formed, and at 45,000 BP, a Plinian eruption occurred.
Begin with the source’s own compact description: “Numazawa (volcano)” is lake in Japan. The dossier treats that line as a proposition to test through Numazawa, volcano and lake, not as a finished interpretation.
Why this record matters
The phrase “lake in Japan” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Place names and jurisdictional language are key evidence: both can reveal earlier catalogue descriptions and overlooked record series. The source revision retrieved here is dated Aug 15, 2026. The linked authority identifier is Q11554492. Authority coordinates are 37.455, 139.573. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
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.
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.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Numazawa (volcano)”, its source revision and the description used here.
- Expand the search: follow Numazawa (volcano) primary sources, Numazawa (volcano) archive and Numazawa research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Numazawa (volcano)”?
- What physical evidence or contemporary plan supports the description?
- Which authority defined the place, boundary or structure at the relevant date?
Search terms from this dossier
This entry incorporates text from “Numazawa (volcano)” 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.