Hidden deep in northern Cambodia, Koh Ker is one of the country's most remarkable ancient archaeological sites. Surrounded by forest and located away from the better-known temples of Angkor, the site offers visitors a glimpse into a distinctive period of Khmer history when the centre of imperial power temporarily moved away from Angkor.
Koh Ker was not simply a collection of ancient temples. During the 10th century, it became an important political, religious and architectural centre of the Khmer Empire. Under King Jayavarman IV, the royal capital was established at Koh Ker in 921 CE, beginning a relatively short but significant period in the history of the Khmer civilization.
One of the site's most recognizable landmarks is Prasat Thom and its seven-tiered pyramid, which rises dramatically above the surrounding landscape. But the pyramid is only part of a much larger archaeological complex. Ancient roads, reservoirs, temples, sculptures and other remains reveal the scale of the city that once existed here.
Koh Ker is also particularly important for its distinctive artistic and architectural style. The sculptures associated with the site are known for their powerful forms and dynamic expressions, while its large-scale stone construction demonstrates the technological and architectural ambitions of the Khmer builders of the period.
In 2023, Koh Ker was inscribed on the UNESCO World Heritage List as “Koh Ker: Archaeological Site of Ancient Lingapura or Chok Gargyar,” recognizing its outstanding cultural significance and its contribution to the development of Khmer architecture and art.
Here are seven fascinating facts that help explain why Koh Ker holds such an important place in Cambodia's history and cultural heritage.
1. Koh Ker was once a capital of the Khmer Empire.
Koh Ker served as a Khmer imperial capital during the 10th century. UNESCO identifies it as a capital from 921 to 944 CE, with the political centre later returning to Angkor.
2. King Jayavarman IV established Koh Ker as the new capital.
King Jayavarman IV established the city in 921 CE. UNESCO says Koh Ker and Angkor existed as rival capitals between 921 and 928 before Koh Ker became the sole capital.
3. Prasat Thom contains a spectacular seven-tiered pyramid.
The principal pyramid, commonly known as Prasat Prang, rises about 35 metres above the surrounding landscape. UNESCO describes it as an exceptional architectural feature of the site.
4. Koh Ker is famous for its distinctive “Koh Ker Style” of sculpture.
The site developed a distinctive artistic style characterized by bold, expressive figures and a strong sense of movement. UNESCO says this style continued to influence Khmer and Southeast Asian artistic expression after Koh Ker ceased being the capital.
5. The ancient city used enormous monolithic stone blocks.
One of Koh Ker's major architectural innovations was the extensive use of very large monolithic stone blocks. UNESCO considers this construction technology one of the site's outstanding characteristics and says it influenced later Khmer monumental construction.
6. Koh Ker contains far more than just one pyramid temple.
Cambodia's Ministry of Culture and Fine Arts states that the Koh Ker archaeological site contains 169 ancient sites, including 76 temples, settlement areas, roads, irrigation systems, ponds, reservoirs and dams.
7. Koh Ker became a UNESCO World Heritage Site in 2023.
UNESCO inscribed “Koh Ker: Archaeological Site of Ancient Lingapura or Chok Gargyar” on the World Heritage List in 2023, under criteria (ii) and (iv). The inscribed property covers 1,187.61 hectares, with a buffer zone of 3,523.77 hectares.
A useful additional fact
The Cambodian Ministry of Culture and Fine Arts says Koh Ker was known in Old Khmer as “Chok Gargyar” and by the Sanskrit name “Lingapura.” It also identifies Prasat Prang as the state temple, which housed a 4-metre-tall Shiva linga called Tribhuvanesvara.
For publication, I would use the UNESCO figures and terminology as the primary reference, because some older Cambodian tourism pages give slightly different dates or counts. For example, the Ministry of Tourism page says the complex contains 96 temples, while the Ministry of Culture and Fine Arts' newer 2026 page gives 169 ancient sites, including 76 temples.