The vowel system of Mundabli (Yemne-Kimbi, Cameroon) is rich in contrasts involving lower vocal tract activity. In this study, we aim to characterize the acoustics and articulation of the three sets of vowels in the language, which we refer to as pharyngeal, plain, and lax. Acoustic time series data reveal that pharyngealization raises F1 and lowers F2 and F3; it also conditions tense or creaky voice quality relative to the plain and lax vowels. Ultrasound data suggest that these acoustic properties can typically be attributed to a lower pharyngeal or epilaryngeal constriction. The data also suggest that the lax and plain vowels may exhibit an advanced tongue root contrast. Variation in the articulatory implementation of pharyngealization observed in the ultrasound data is discussed.