An Austro-Asiatic linguistic family of southern Asia, comprising Mon, Khmer, and a number of languages of mountain populations in the Indochinese Peninsula as well as of India. Mon-Khmer languages constitute the indigenous language family of mainland Southeast Asia. They range north to southern China, south to Malaysia, west to Assam state in India, and east to Vietnam. The most important Mon-Khmer languages, having populations greater than 100,000, are Vietnamese, Khmer, Muong, Mon, Khasi, Khmu, and Wa. There are 130 languages total.