Halia is an Austronesian language of Buka Island and the Selau Peninsula of Bougainville Island, Papua New Guinea.
The phonology of the Halia language:[2] Diphthong vowel sounds include /ei, au, ou/.
The first set functions as the subject when preceding the verb.
Set 2 functions as a subject or object when following the verb.
[3] In the 1960s Francis Hagai produced a series of liturgies in Halia as part of his work with the Hahalis Welfare Society.