The Western Area of Ayutthaya is bordered in the north by the Chao Phraya River and in the east by Khlong Takhian - called “Canal du Grand Cochon” by early French visitors. Highway No 3060 loosely frames the western boundary. Geographically, the nearly defunct Khlong Klaep, running north of Wat Chai Watthanaram, more or less indicates the border between two important fields - Thung Prachet and Thung Pak Kran. The Thung Prachet field is in the north, and the Thung Pak Kran field is in the south. This area was the least populated area during the Ayutthaya period.

The Western Area contains a total of 27 temple sites.