Wat Rat Bua Khao, or the Monastery of the Royal White Lotus, is an active monastery located off the city island in the western area of Ayutthaya in the Ban Mai Sub-district.
The monastery stood on the north bank of the Maha Phram Canal (1), a connection canal to the Chao Phraya River in the Ayutthaya era (2).
Wat Khanon stands on the opposite side of the waterway.
The monastery was near the northern tax station or a toll house (Khanon), which checked boats for prohibited items and weapons as prescribed by law in the Ayutthaya period.
The monastery dates to 1657 CE in the reign of King Narai (1656-1688 CE) and, based on the Temple Registration System of the National Office of Buddhism, received its Wisung Kham Sima in 1667 CE.
The history of the temple is unknown.
The monastery features an ordination hall and other monastic structures.
Wat Rat Bua Khao features under the name Wat Tamnak on the Monthon Krung Kao map of 1916 CE.
Wat Rat Bua Khao is in geographical coordinates: 14° 22' 20.4" N, 100° 31' 23.1" E.