- Source: Mountain Koiali language
Mountain Koiari (Koiali) is a language of Oro Province and Central Province, Papua New Guinea. It is not very similar to the other language which shares its name, Grass Koiari. Half of its speakers are monolingual.
It is spoken in Barai, Efogi (9.156234°S 147.665661°E / -9.156234; 147.665661 (Efogi No. 1)), and Koiari villages of Koiari Rural LLG, as well as in Hiri Rural LLG.
