This paper discusses vowel harmony; a type of assimilatory process in Gurenε (Mabia language), within the Autosegmental phonology framework (Goldsmith 1976, 1990, Clements 1977). The phenomenon exists in many African languages and has received descriptive analyses in previous studies on Gurene (see Azagesiba 1977, Dakubu 1996, Nsoh 1997, Adongo 2008). These works were however limited in scope and lacked theoretical grounding. This paper employs the feature spreading approach within Autosegmental phonology to characterise cases in which segments share the same specifications or assimilate to a feature or a group of features (Ewen &Van der Hulst 2001: 30-31). For instance, in Gurenε, vowels in a specific harmonic domain in any given word ...