Halia language

Halia is an Austronesian language of Buka Island and the Selau Peninsula of Bougainville Island, Papua New Guinea.

Phonology
The phonology of the Halia language:

Vowels
Diphthong vowel sounds include.

exists, but not as a monophthong.

Literature
In the 1960s Francis Hagai produced a series of liturgies in Halia as part of his work with the Hahalis Welfare Society.