The city walls of Phitsanulok were made of clay similar to those of the Sukhothai era. The walls were built at the command of King Borom Trailokanat of Ayutthayato prevent attacks from both the Lanna and Burmese Kingdoms. It was not until King Rama I of the Rattanakosin era that the walls were destroyed. The demolition was undertaken to prevent enemies using the city walls as shelter for their troops.
Today, the remaining walls can be seen in the area of Wat Noi and Phitsanulok Police Station. City Moats are 12 metres wide and are visible in the western area of the city parallel to Phra Ruang Road.