20,000 (Shearer and Sun Hong Kai 2002), decreasing. Eastern Ersu (Ersu) 13,000, Central Ersu (Duoxu) 10 or less, Western Ersu (Lizu) 4,000.
South central Sichuan Province, lower reaches of the Dadu river; Liangshan Yi autonomous prefecture, Ganluo, Yuexi, Mianning, and Muli counties; Ya’an prefecture, Shimian and Hanyuan counties; Ganzi Tibetan autonomous prefecture, Jiulong county; dispersed among Yi, Chinese, and Tibetan peoples.
7 (Shifting). Language of recognized nationality: Tibetan.
Duoxu (Central Ersu), Ersu (Eastern Ersu), Lisu (Liru, Lüzü, Western Ersu).
SOV; adjectives and number-classifier constructions follow noun heads; consonant cluster onsets; most morphemes monosyllabic; 2 tones, word-template zone.
Ersu Shaba Picture Writing [Qaag], used until some time before 2003, limited usage, used in religious ceremonies.