Wat Pa Phai or the "Monastery of the Radiant Forest" was situated on the city island in the Historical Park in Pratu Chai sub-district.
On its north stood San Phra Kan, a Brahmin shrine (south of the City Foundation Stone or Lak Mueang), while Wat Pa Mo (no traces anymore) stood in the southwest and Wat Rak in the west.
There are no traces of foundations or brick work at ground level and the temple is classified as disappeared.
The monastery stood once on the place where is at present a Thai style house, just north of the old Provincial Building, where Ayutthaya's Tourist Office is located (the Thai style house belongs to the Tourist Authority Thailand - TAT).