20,000 (Shearer and Sun Hong Kai 2002), decreasing. Eastern Ersu (Ersu) 13,000, Central Ersu (Duoxu) 10 or less, Western Ersu (Lizu) 4000.
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.
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
Most officially classified within Tibetan nationality; some as Han nationality. Traditional religion.