Editing Nauruan language (section)

===Vowels===
There are 12 phonemic vowels (six long, six short).  In addition to the allophony in the following table from {{Harvcoltxt|Nathan|1974}}, a number of vowels reduce to {{IPA|[ə]}}:<ref name="Nathan_a" />
<!-- (Nathan 1974) doesn't elaborate on the environmental conditions leading to such allophony -->

{| class="wikitable" style="text-align: center;"
|-
! Phoneme !! Allophones || Phoneme || Allophones
|-
! {{IPA|/ii/}}
| {{IPA|[iː]}}
! {{IPA|/uu/}}
| {{IPA|[ɨː ~ uː]}}
|-
! {{IPA|/i/}}
| {{IPA|[ɪ ~ ɨ]}}
! {{IPA|/u/}}
| {{IPA|[ɨ ~ u]}}
|-
! {{IPA|/ee/}}
| {{IPA|[eː ~ ɛː]}}
! {{IPA|/oo/}}
| {{IPA|[oː ~ ʌ(ː) ~ ɔ(ː)]}}
|-
! {{IPA|/e/}}
| {{IPA|[ɛ ~ ʌ]}}
! {{IPA|/o/}}
| {{IPA|[ʌ]}}
|-
! {{IPA|/aa/}}
| {{IPA|[æː]}}
! {{IPA|/ɑɑ/}}
| {{IPA|[ɑː]}}
|-
! {{IPA|/a/}}
| {{IPA|[æ ~ ɑ]}}
! {{IPA|/ɑ/}}
| {{IPA|[ɑ ~ ʌ]}}
|}

Non-open vowels (that is, all but {{IPA|/aa/, /a/, /ɑɑ/ /ɑ/}}) become non-syllabic when preceding another vowel, as in {{IPA|/e-oeeoun/}} → {{IPA|[ɛ̃õ̯ɛ̃õ̯ʊn]}} ('hide').<ref>{{Harvcoltxt|Nathan|1974|p=482}}</ref>