Northern Khmer: Khmer of Khmer in Northern Thailand by Bauer
Khmer is the official language of the more than 14 millions people in Cambodia. In addition, there are approximately more than 1 million Khmer are living across the border in Southeast Thailand. They are the decedents of the Khmer empire who are living in the provinces of Surin, Sisaket, Buriram, and Nakhon Ratchasima. Their native language, also called Khmer (Northern Khmer); however, it is distinct from, but similar to, Central Khmer. Since Thai is the only language taught in schools, many Northern Khmer are bilingual, speaking Northern Khmer while at home. Here is the fact of Northern Khmer by Christian Bauer.