Zhongu
Zhongu is a Sino-Tibetan language spoken in China. Glottolog rates it threatened.
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Zhongu (Zhonggu) Tibetan is a Tibetic language of Sichuan, China, once considered a dialect of Khams. It is spoken in Songpan County.
From Wikipedia · Zhongu Tibetan language · CC BY-SA 4.0