The Chong language is marked by its unusual 4-way contrast in register. Its grammar has not been extensively studied, but it is unrelated to the Thai language which is in the Tai–Kadai language family. 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. Chong is currently considered to be at stage 7 in Joshua Fishman's Graded Intergenerational Disruption Scale (GIDS), where stage 8 is the closest to extinction.
The Chong community in Thailand is primarily located in and around Chanthaburi. While the language spoken in Thailand has been studied recently, the Chong language in Cambodia has not been investigated yet.
A number of varieties of Pearic are called "Chong", and they do not constitute a single language. The majority of varieties are what Sidwell (2009) labeled "Western Chong". This includes the main dialect around Chantaburi on the Thai–Cambodian border. However, the variety called "Chong" in Trat Province of western Thailand, as well as "Kasong" Chong, were classified as "Central Chong" along with Samre, and so should perhaps be considered dialects of Samre rather than of Chong. Similarly, varieties called "Chung" in neighboring Kanchanaburi, but also in Cambodia, were classified as "Southern Chong" along with Suoi and Saoch. The Western Chong dialects are as follows: