Ang Thong is a small province of 968 sq. kms. beside the Chao Phraya River. The original settlement was a key frontier outpost of Ayutthaya when fighting the Burmese, located at Wiset Chai Chan on the banks of the Noi River. Most of the population moved to a new site on the left bank of the Chao Phraya River in the late 18th century, located 108 kms. north of Bangkok.