They can be found around Mount Bosavi, located east of the Strickland River and southwest of the western edge of the central highlands of Papua New Guinea.

Based on this study, it is indicated that Kaluli and Sonia exhibit a significant lexical similarity of 70%, which is higher than any other languages compared.

The languages Aimele, Kasua, Onobasulu, and Kaluli-Sunia exhibit more shared isoglosses among themselves than with the Etoro-Bedamini group.

The unity of the Bosavi languages was quantitatively[clarification needed] demonstrated by Evans and Greenhill (2017).

[3] Pronouns are: The following basic vocabulary words are from the Trans-New Guinea database:[4] The words cited constitute translation equivalents, whether they are cognate (e.g. aubi, awbi, aube for "moon") or not (e.g. dɔa, igi, kele for "stone").