Ulumandaʼ is unusual among the Austronesian languages of Sulawesi for featuring a vowel harmony opposition of front vowels /æ, ø, y/ to corresponding back vowels /ɑ, o, u/ comparable to that of the Uralic languages. Originally, fronted vowels arose from the fronting of back vowels before syllable-final velar consonants*k and *ŋ, but were phonemicized in final syllables when word-final *-m and *-n merged with *ŋ to result in -ŋ but did not front a preceding back vowel unlike original *-ŋ. These fronted vowels then fronted any other back vowels in a word except if a neutral vowel like *e or *i intervened between the vowels.
A contrastive pair includes /uraŋ/ "person" vs. /uræŋ/ [yræŋ] "shrimp".
^Friberg, Timothy; Laskowske, Thomas V. (1989). "South Sulawesi languages"(PDF). In J.N. Sneddon (ed.). Studies in Sulawesi linguistics part 1. NUSA 17. Jakarta: Badan Penyelenggara Seri Nusa. pp. 1–17.
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