This paper deals with vowel duration and Fo correlates of word stress in HalhMongolian, the main dialect spoken in Mongolia. The position of word stress is predictable. The fundamental frequency (Fo) of stressed vowels shows a regular pattern compared to the Fo of unstressed vowels. Maximal and minimal values of Fo in the word are both used to indicate syllable prominence, as does longer vowel duration.

Index Terms: Fundamental frequency, Mongolian, Stress