Cotabato Manobo is a Manobo language spoken in Mindanao, the Philippines.
- /i u/ are realized as [ɪ ʊ] in closed syllables.
- /ɛ/ is realized as [e] when it is preceded by /k/ and in an open syllable.
- /a/ is realized as [ɜ] when it is followed by /h/ or /ʔ/.
- /ɔ/ is realized as [ɒ] when it is followed by /h/, /ʔ/, or /ɡ/, or when word-initial and followed by /k/. For some speakers it may also be realized as [ɒ] before or after /k/ when not word-initial.