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Thavưng orAheu is a language spoken by thePhon Sung people inLaos andThailand. There are thought to be some 1,770 speakers in Laos, largely concentrated inKhamkeut District. A further 750 speakers live in 3 villages ofSong Dao District,Sakon Nakhon Province, Thailand, namely Ban Nong Waeng (in Pathum Wapi Subdistrict), Ban Nong Charoen, and Ban Nong Muang.^[2]

Thavung makes a four-way distinction between clear and breathy phonation combined with glottalized final consonants. This is very similar to the situation in thePearic languages in which, however, the glottalization is in the vowel.^[3]

The vowels can also be long. In Thavung there are 3 Diphthongs: ia ɨa ua.

• Premsrirat, Suwilai (1996).Phonological characteristics of So (Thavung), a Vietic language of Thailand.

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