[4] The Chong language is marked by its unusual four-way contrast in register.
Chong had no written form until 2000, when researchers at Mahidol University used a simplified version of standard Thai characters to create a Chong writing system, after which the first teaching materials in the language appeared.
The Western Chong community in Thailand is primarily located in and around Chanthaburi.
Similarly, the languages called "Chung" in Kanchanaburi Province and in Cambodia are dialects of Sa'och, and were classified as "Southern Chong" along with Suoi.
Isara Choosri (2002) lists the following dialects of Chong spoken in Chanthaburi Province.