CHACHOENGSAO or Paet Rio is located on the 80-kilometer east of Bangkok. Its fertility is due to Bang Pakong River. It is an important venue for agricultural products in the Central Region, with mango as the most popular fruit of the province. Moreover, it is the location of the sacred Phra Phutthasothon Buddha image.

Derived from Khmer, the name “Chachoengsao” means “deep canal” , while the name of “Paet Rio” (Paet means eight and Rio means stripes) has been believed to have come from the way dried fish (which are abundant in the area) were being pierced into eight stripes.