Berawan is an Austronesian language spoken in eastern Sarawak, Malaysia.
Proto-Berawan is the reconstructed proto-language of all Berawan language varieties. Its phonology has been extensively reconstructed by Jürgen M. Burkhardt in 2014.
All preantepenult syllables were lost in Proto-Berawan: *kalapani > *lÃÂpineÃÂ > metathesised *pÃÂlineÃÂ 'swallow (bird)'. Following this stage, all vowels in antepenult syllables were neutralised into *ÃÂ: *tinaÃÂi > *tÃÂnaÃÂeÃÂ 'small intestines'.
The vowel *i, when preceding a vowel, inserted a glide in between, followed by other developments (*-iy- > *-iyy- > *-ÃÂyy- > *-ÃÂjj-). Meanwhile, *àlargely did not change during Proto-Berawan stage, but it geminated the following consonant (*pÃÂnuq > *pÃÂnno 'full'). The only exceptions were in word-initial position, in two words changed early into *a (*ÃÂzan, *ÃÂmbaw > *acciÃÂn 'notched log ladder', *appiÃÂw 'high'), while in two others simply deleted it (*ÃÂpat, *ÃÂsuà  > *pat 'four', *coà  'rice mortar').
When following other consonants, *a remains, but when following voiced (*b, *ò, *d, *z, *g) or palatal (*j, *ñ, *y) consonants, it became *i instead (*batu > *bittoh 'stone', *ia > *jiÃÂh '(s)he/it'). The consonant *l did not block the raising (*balu > *billoh 'widow').