Phlong is spoken in the Irrawaddy Delta and
northern Tenasserim areas of Myanmar (Burma) and in
southwestern Chiang Mai, Thailand. Phlong has four tones
on main syllables: high, mid, low and falling. Syllables
with final glottal stop may only have high (which rises in
this environment) or falling tone. Final velar nasal
often surfaces as nasalization of the end of the vowel,
sometimes with a raised offglide.

Cooke, J.R., Hudspith, J.E., Morris, J.A. 1976. Phlong
(Pwo Karen of Hot District, Chiang Mai). In W.A. Smalley
(ed.), Phonemes and Orthography: Language Planning in Ten
Minority Languages of Thailand. Pacific Linguistics,
Series C, 43:187-220.