Brief synthesisKoh Ker: Archaeological Site of Ancient Lingapura or Chok Gargyar was a capital of the Khmer Empire between 921 and 944 CE. Koh Ker demonstrated markedly unconventional city planning and architectural features, which were primarily the result of the combination of King Jayavarman IV’s grand political ambition and the two outstanding innovations that helped to materialise this ambition: the artistic expressions of the Koh Ker Style, and the construction technology using very large monolithic stone blocks. Criterion (iv): The archaeological site of Koh Ker is a prototype of a new urban landscape featured by grand-scale buildings, thanks to the use of colossal monolithic stone blocks for construction and sculptures. The layout and built environment of the entire ancient capital are evident. Protection and management requirementsKoh Ker: Archaeological Site of Ancient Lingapura or Chok Gargyar is protected by the Law on the Protection of Cultural Heritage (1996).