Prang Sila Chong Khao Don Tuan, locally known as “Prasat Don Tuan,” is a relatively small ancient Khmer sanctuary, yet it holds significant historical, religious, and geographical importance in the southern Isan border region. The sanctuary is located along the Phanom Dong Rak mountain range within Khao Phra Wihan National Park near the Thai–Cambodian border. In the past, this area served as an important route linking the Mun River basin with the Khmer Empire, making it strategically significant for both religious activities and ancient travel.Archaeologists believe the sanctuary was constructed around the 16th Buddhist century, during the late Baphuon period continuing into the early Angkor Wat era, when Khmer civilization strongly influenced the lower northeastern region of Thailand. Important evidence includes ancient Khmer inscriptions discovered at the site, as well as the architectural style of the sanctuary base and building materials characteristic of Khmer art.

The name “Don Tuan” originates from the local Khmer dialect spoken in southern Isan. The word “Don” refers to a hill or elevated ground, while “Tuan” refers to an open area or ridge, accurately reflecting the sanctuary’s location on a cliff-top ridge of the Phanom Dong Rak mountains.The sanctuary consists of a single brick tower built on a laterite base and faces east according to Hindu beliefs. It is believed to have originally been dedicated to the god Shiva, with a Shiva lingam once enshrined inside for Brahmanical-Hindu rituals. Visible remains today include the main sanctuary base, traces of a library structure, rows of laterite pillars that once formed part of a gallery enclosure, and an ancient reservoir or baray, an essential feature of Khmer religious architecture.Although much of the structure has deteriorated over time, clear traces of Khmer craftsmanship remain visible, especially the brick construction technique without mortar and the use of laterite as the primary structural foundation. Fragments of stone lion sculptures, believed to have guarded the entrance to the sanctuary, have also been discovered.

One of the sanctuary’s most remarkable features is its dramatic cliffside location, offering panoramic views of forests and plains stretching into Cambodia. Surrounded by the peaceful natural landscape of the Phanom Dong Rak range, the site has a mysterious and sacred atmosphere distinct from more crowded historical attractions. Many visitors describe it as a “hidden ancient sanctuary in the forest” because of its tranquility and relatively low number of tourists.Local villagers continue to regard the sanctuary as a sacred place. Visitors often come to pay respects, pray for blessings, and perform traditional ceremonies believed to bring protection, prosperity, and good fortune, especially for those traveling through the border region.Prang Sila Chong Khao Don Tuan is also connected to a network of important Khmer archaeological sites nearby, including Pha Mo E Daeng and Prasat Sa Kamphaeng Yai, reflecting the prosperity and influence of Khmer civilization across southern northeastern Thailand in ancient times.

Today, the sanctuary is an ideal destination for travelers interested in history, archaeology, and nature. Visitors can experience ancient Khmer architecture, peaceful forest surroundings, and beautiful borderland scenery all in one place.