Phonology
Iwal distinguishes 5 vowels and 16 consonants. Unlike most of its neighboring languages, it distinguishes the lateral /l/ from the trill /r/, the latter derived from earlier *s, as in aru from Proto-Oceanic (POc) *qasu 'smoke', ruru- from POc *susu 'breast', and ur from POc *qusan 'rain'. Otherwise it appears to be the most phonologically conservative language in the South Huon Gulf chain (see Ross 1988:154–160). It has retained POc *t as /t/ (not /l/ or /y/) and POc *mw as /mw/ (not /my/ or /ny/), as in mwat 'snake' from POc *mwata.
Read more about this topic: Iwal Language