Thailand is a multi-ethnic country with nearly 70 ethnic groups. Obviously, the population along Mekong River in Thailand is also diversified in terms of ethnicity and religion. Going from the upper to the lower basin of Mekong River in Thailand, there are approximately 6 ethnic groups with different beliefs and customs: Thai, Khmer, Khmu, Vietnamese, Meo and Lahu among which Thai and Khmer are the dominant ethnic.
Thai is the most dominant ethnic in Thailand in general and along Mekong River in particular. Also known as Siamese, Thai people have long history of settling in the land of Thailand since the 10th century.
Due to mutual cultural exchange as well as the migration flows between the two countries throughout the history, the population of Khmer community in Thailand account for a remarkable of the whole population of Thailand.