History of Buddhism in Cambodia

Theravada Buddhism is the state religion of Cambodia, which has been present since at least the 5th century. == Suvannaphum == King Ashoka sent missionaries to the land of Suwannaphum, which has sometimes been identified as the mainland southeast Asian region of Mon (now a state in Myanmar, the state of Mon) and Khmer (now Cambodia) people.

Source: Wikipedia — History of Buddhism in Cambodia (CC BY-SA 4.0)