Iwanai, Shiribeshi region, Hokkaidō

樺杣内

かばそまない Kabasomanai

The name survives in the tunnel that used to carry the road past the waterfall.

Ainu spellings: Kapar-so-oma-nay

Analyses

カパソマナイ

proposed

stream with a flat waterfall in it

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 describes the Hashigo-daki itself.