Tainai
city in Niigata Prefecture, Japan
Tainai (胎内市, Tainai-shi) is a city located in Niigata Prefecture, Japan. As of 31 December 2020, the city had an estimated population of 28,495 in 10,821 households, and a population density of 110 persons per km2 (288/sq mi). The total area of the city was 264.89 square kilometres (102.27 sq mi).
Geography
Tainai is located in northern Niigata Prefecture, bordered by Yamagata Prefecture to the east and the Sea of Japan to the west. The city area has an elongated shape from east to west along the Tainai River basin. There are number of dams in Tainai, including the Tainaigawa Dam and Tainai Dam.
Surrounding municipalities
Niigata Prefecture
Murakami
Sekikawa
Shibata
Yamagata Prefecture
Oguni
Climate
Tainai has a Humid climate (Köppen Cfa) characterized by warm, wet summers and cold winters with heavy snowfall. The average annual temperature in Tainai is 13.9 °C (57.0 °F). The average annual rainfall is 2,331.2 mm (91.78 in) with September as the wettest month. The temperatures are highest on average in August, at around 26.5 °C (79.7 °F), and lowest in January, at around 2.4 °C (36.3 °F).
“Tainai” enters the record as city in Niigata Prefecture, Japan. Crown Archives preserves that source wording while asking what Tainai, city and Niigata can confirm, complicate or overturn.
Why this record matters
“Tainai” is worth following because a concise public description often conceals a longer documentary argument. Here, Tainai, city and Niigata provides the most credible route into that argument.
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 Sep 17, 2026. The linked authority identifier is Q877266. The first chronological checks are 2020.
Architectural summaries often privilege surviving fabric and can understate demolished phases, contested use or displaced communities. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. 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 “Tainai”, its source revision and the description used here.
- Expand the search: follow Tainai primary sources, Tainai archive and Tainai 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 “Tainai”?
- What physical evidence or contemporary plan supports the description?
- Which earlier names or jurisdictions may reveal additional records?
Search terms from this dossier
This entry incorporates text from “Tainai” 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.