Mount Iwafune
mountain in Tochigi, Japan
Mount Iwafune (岩船山, Iwafunesan, Iwafuneyama) is a mountain located in Tochigi City, Tochigi Prefecture (formerly Iwafune Town), in Northern Kanto, with an elevation of 172.7 meters. It is the southernmost peak of the Ashio Mountains. The origin of the characters used in the name—"boat" (舟) for the stone quarried here and the former town name, and "ship" (船) for the mountain name—is unclear. The surrounding area is designated as a nature conservation area (designated on July 19, 1977), where the name is written as "岩舟山" (Iwafuneyama).
It has been a major sacred site, with Kōshō-ji Temple attracting the faith of people in the Eastern provinces. The mountain has a peculiar shape with steep cliffs, which has gradually changed due to quarrying of Iwafune stone since the Edo period. Since the late 1970s, the abandoned quarry site has been used for location shooting, including special effects scenes with explosions, taking advantage of its mystical landscape.
During the Great East Japan Earthquake in March 2011, the western peak collapsed in a V-shape, and another part of the mountainside crumbled from a height of about 140 meters (no casualties or damage to houses).
At the southeastern foot of the mountain is the site where Emperor Meiji once held an outdoor tea ceremony (nodate), and the surrounding area has been developed as Kabutoyama Park.
Production of Iwafune stone
The mountain was quarried from the Edo period to the Shōwa period for foundation materials such as retaining stones (kenchi-ishi) and cut stones.
Begin with the source’s own compact description: “Mount Iwafune” is mountain in Tochigi, Japan. The dossier treats that line as a proposition to test through Mount, Iwafune and mountain, not as a finished interpretation.
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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 7, 2026. The linked authority identifier is Q11475591. Authority coordinates are 36.330, 139.654. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1977 and 2011.
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This entry incorporates text from “Mount Iwafune” 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.