岩知志 いわちし Iwachishi
Biratori, Hidaka region, Hokkaidō
Ainu spellings: Iwa-cis, Iwan-cis
Both readings turn on cis, and the article leaves the choice between the hollow below the cliff mountain and the six peaks along it open.
Location
42.7426, 142.3653 · Coordinates: OpenStreetMap Nominatim, 2026-09-10, on 岩知志. Open in OpenStreetMap
Readings in the place-name tables: イワチシ Iwa-cis
Referents
- mountain The cliff mountain at Iwachishi and the peaks along it
Analyses
iwa-cis
イワチシ ‘hollow of the rocky mountain’ proposed- iwa ‘rocky mountain’
- cis ‘hollow between mountains’
Proponent: zenibako_trek（小樽銭函地名歴史研究会） (zenibako_trek (Otaru Zenibako Place-Name and History Society))
cis can name the hollow between two mountains; the reading is taken to point at the foot of the cliff mountain.
iwa is a dictionary word in the sense used; the article gives the sense of cis it needs without a dictionary citation.
iwan-cis
イワンチシ ‘six standing rocks’ proposed- iwan ‘six’
- cis ‘standing rock’
Proponent: zenibako_trek（小樽銭函地名歴史研究会） (zenibako_trek (Otaru Zenibako Place-Name and History Society))
The reading refers to six peaks standing along the cliff mountain; the author calls it a reading worth attention without preferring it.
iwan 'six' is a dictionary word; the article gives cis in the sense 'standing rock' without a dictionary citation and leaves the choice between the two readings open.