Phetchaburi, locally known by Thais as Muang Phetch, is located 160 kilometers south of Bangkok. One of Thailands central region provinces, Phetchaburi is situated on the western shore of the Gulf of Thailand with an overall area of approximately 6,225 square kilometers. Its terrains throughout the western border, where Tanaosri Range lies as a natural border between Thailand and Myanmar, are mountainous dense jungles. In the east, there is an 80-kilometer long coastline towards the Gulf of Thailand.

A very old city which used to be an important royal fort town, Phetchaburi had been given several names such as, Phripphri, Phripphli or Phetchaphli. Some historians have gone as far as to say that Phetchaburi could have been named in Indian style, as the Indian influence in those days day was strong. Others put forward the idea that the name Phetchaburi might have originated from Maenam Phetch the most important river of the town.