Prasat Phimai, which is Mahayana Buddhist Sanctuary, is situated in Phimai District, Nakhon Ratchasima Province.
“Phimai” is the same word as “Vimai” which appears in the Khmer script stone inscription found on the door frame of the entrance. Phimai is a large rectangular ancient city surrounded on all sides by moats and boundary walls. The principal tower, Prasat Phimai, is situated in the centre of the city. The Mun River passes on the northern and eastern sides while the Khem Stream passes on the southern side. The Chakarat Stream passes on the western side and enters the Mun River at the Songkhran. The ponds, Sa Kaew Sa Phlung and Sa Khwan, are located inside the walls of the ancient city, while the ponds Sa Phleng, Sa Bohd and Sa Phleng Haeng are located outside.
There is also a large reservoir to the south. The construction of Prasat Phimai commenced in the 11th-12th centuries C.E. with additions during the 13th century C.E. These dates are based on evidence found in stone inscription. The archaeological and artistic features of Prasat Phimai differ from those found in other stone sanctuaries. While most of them face east, Phimai faces southeast, the direction of Angkor capital of the ancient Khmer Empire.