Prasat Khao Lon stands on a low sandstone hill at Ban Charoen Suk, in Thap Rat subdistrict, Ta Phraya district, Sa Kaeo province, eastern Thailand. The Fine Arts Department describes the hill as close to the Cambodian border. The setting is part of the site’s significance: this was not a temple placed in an anonymous flat landscape, but a sanctuary whose elevation made it visible across its surroundings and tied it to routes and communities in the border region.
A 2025 study in Silpakorn University’s archaeology journal identifies the temple as an early-eleventh-century Khmer sanctuary in Baphuon style, associated with the Angkorian period. The Fine Arts Department’s heritage record dates its construction to the middle of the sixteenth Buddhist century, citing a door-frame inscription dated 1559 in the Buddhist Era and stylistic evidence from a sandstone lintel. The different descriptions converge on an eleventh-century context; the article uses that broad period rather than claiming a precise construction year.