Turkish language is mainly spoken in Azerbaijan and Iran (Johanson 2010). After Farsi as the official language, Turkish, with approximately 15–20 million speakers, has the most speakers in Iran (Crystal 2010). Most of the speakers inhabit in the four provinces of the northwestern part of Iran.

This study addresses the place of articulation of stop consonants in Azari Turkish. The second formant frequency (F2) varies as to the place of articulation of the neighboring consonant. Thus, F2 transition from a consonant to the following vowel or from a vowel to the following consonant provides an acoustic cue to the place of articulation of the adjacent consonants. In a production experiment,, a sample of read speech was recorded from 10 native speakers of standard Azari Turkish in which Turkish stops preceded any of the 9 Turkish vowels. locus equations and the regression coefficients of F2 onset as function of F2 vowel were extracted to determine the magnitude of coarticulation between Azari Turkish stops and the following vowels in CV sequences. Results suggested significant positive correlation between F2 onset and F2 vowel. Overall, the results showed that slopes, coefficients and intercepts of locus equations were reliable acoustic cues to stop place of articulation in Azari Turkish.