Wat Pa Ek, or the Monastery of the Principal Quarter, is a defunct temple located on Ayutthaya's city island in Ho Rattanachai Sub-district.

The monastery was situated between Khlong Makham Riang (1) and the Front City Canal (2), north of Wat Suwandararam and more or less between Wat Khok Khamin and Wat (Khok) Phao Khao.

Wat Khok Khamin stood between Pa Thon Road and Rojana Road today (3).

Historical data about the monastery and its establishment are unknown.

Wat Pa Ek shows on a 19th-century map drawn by an unknown surveyor.

The temple is not mentioned on Phraya Boran Rachathanin's map drafted in 1926 CE.

A 2007 GIS Fine Arts Department map indicates Wat Khok Khamin in geographical coordinates 14° 21' 10.48" N, 100° 34' 36.24" E. I believe this is not correct as the 19th-century map indicates two different sites being Wat Pa Ek and Wat Khok Khamin. Wat Khok Khamin was situated to the east of Wat Pa Ek, more or less on the same north-south axis as Wat Krabue and Wat Kho/Wat Wua.


(1) Khlong Makham Riang, or the Canal of the aligned Tamarind Trees, was before called Khlong Nai Kai. It is a still existent canal situated east on Ayutthaya's city island. The canal was a shortcut in the oxbow of the old Lopburi River. It has today its origin at Khlong Ho Ratana Chai below Wat Senasanaram and the Front Palace, and its mouth at the present Chao Phraya River, west of Phet Fortress. At the mouth was one of the eleven water gates of Ayutthaya called Pratu Nai Kai. The southern exit, which has today a water regulator, has been altered. The original mouth of the canal was about 170 metres more south, close to Pom Phet. Khlong Makham Riang is one of the three large canals running north to south, of which two still are in existence.

(2) Khlong Na Mueang or Khu Khue Na (Front Moat) ran east of the city of Ayutthaya. The former moat is said to have been dug in the reign of King Ramathibodhi I, also called King U-Thong. It was initially a defensive moat or could have been a separation ditch (borderline) between the ancient city of Ayodhya situated in the oxbow of the Pa Sak River and the new established city of Ayutthaya in the oxbow of the Lopburi River. The Royal Palace stood on the premises of the present ruins of Wat Phra Si Sanphet, and the earthen walls surrounding the city were likely not further than the moat, which became later known as Khlong Pratu Khao Pluak.

(3) Rojana Road is a post Ayutthaya era road.