Mang

Definitely endangered, around 2300 native speakers. 

The Austroasiatic language Mang (Chinese; autonym: [ma35]) is spoken in Vietnam, China, and Laos. It is primarily spoken in Vietnam's Lai Châu Province and across the border in China's Jinping County. It was only discovered in 1974.

The Mang people are also known as Chaman, Abi, Mengga, Bageran, and Mo in China. 

In 1999, there were 606 Mang speakers in China. The Mang of China claim to have just moved from Vietnam. The data in Gao's (2003) Mang comes from Xinzhai, Nanke Village, and Jinshuihe Township. Gongdaniu, Luowuzhai, Pinghe (in Xiazhai, Zhongzhai, Shangzhai), Hetouzhai, Guanmuzhai, Naxizhai, Bianjiezhai, Longshuzhai, Caoguoping, and Nanke are among the 12 Mang villages listed in the Jinping County Almanac from the Republic of China time.

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Sources:

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Mang at Ethnologue 

Gao, Yongqi 高永奇 (2003). 莽语硏究 [A Study of Mang] (in Chinese). Beijing: Minzu chubanshe. p1

 "Người Mảng". Trang tin điện tử của Ủy ban Dân tộc (in Vietnamese). 14 July 2006. Archived from the original on 2013-12-02