Lake Haruna
caldera lake in Takasaki, Gunma Prefecture, Japan
Lake Haruna (榛名湖, Haruna-ko) is a caldera lake. It lies near the summit of Mount Haruna, within the city limits of Takasaki, Gunma Prefecture, Japan. A former name for the lake is Lake Ikaho (伊香保沼, Ikaho-numa).
In the summer, the lake is a popular destination for campers. The surface freezes in the winter, and it affords skating and ice fishing for wakasagi.
The lake lies a 90-minute bus ride from Takasaki Station. It can be reached in 40 minutes by car from Shibukawa-Ikaho Interchange, #12 on the Kan-Etsu Expressway. The road to the lake is one of 10 musical roads located in Gunma prefecture alone; the song played is "Sweetly Sings the Donkey," chosen because the melody is known as "At a Quiet Lakeside" in Japan.
A kayōkyoku refers to the lake in its title. Akira Fuse recorded the tune, named Haruna-ko no shōjo.
The public source identifies “Lake Haruna” as caldera lake in Takasaki, Gunma Prefecture, Japan. This brief keeps that definition visible, then builds a research path around Lake, Haruna and caldera.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Lake Haruna”, the useful work is to connect “caldera lake in Takasaki, Gunma Prefecture, 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 Jul 26, 2026. The linked authority identifier is Q3214922. Authority coordinates are 36.475, 138.867. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
A single description cannot reconcile every naming convention, rebuilding phase or administrative transfer associated with a place. 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 “Lake Haruna”, its source revision and the description used here.
- Expand the search: follow Lake Haruna primary sources, Lake Haruna archive and Lake 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 “Lake Haruna”?
- Which authority defined the place, boundary or structure at the relevant date?
- Which earlier names or jurisdictions may reveal additional records?
Search terms from this dossier
This entry incorporates text from “Lake Haruna” 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.