Koh Ker is an archaeological site located in northern Cambodia. It was the capital of the Khmer Empire from 928 to 944 CE and is home to several ancient temples and other structures. The most significant monument at Koh Ker is the Prasat Thom, a massive, pyramidal temple that once housed a large statue of the Hindu god Shiva.

In addition to the Prasat Thom, Koh Ker also features several smaller temples and a number of other structures, including a palace, a hall for public gatherings, and a system of ponds and reservoirs. The site is considered one of the most important examples of ancient Khmer architecture and provides valuable insights into the political, religious, and cultural history of the Khmer Empire.

Koh Ker is located in the jungle and is surrounded by hills and forests, making it a unique and remote destination for tourists and archaeologists alike. Despite its historical and cultural significance, the site has not yet been fully excavated and many structures remain hidden beneath the jungle canopy.