Koh Ker (Prasat Thom)

Koh Ker, deep in the forests of northern Cambodia roughly 120 km from Siem Reap, briefly served as the capital of the Khmer Empire — then called Chok Gargyar — from 928 to 944 CE, established under King Jayavarman IV and continued under his son Harshavarman II. An inscription from the period records that more than ten thousand people lived at Koh Ker during its short span as imperial capital, a scale that underscores how significant a center it was despite its remoteness and its brevity compared to Angkor’s centuries-long dominance.

The site’s central monument, Prasat Thom, is a dramatic seven-tiered sandstone pyramid known as “the Prang,” standing roughly 36 meters high. A Sanskrit inscription at Prasat Thom records the consecration of a Shiva lingam in 921 CE, and a massive lingam, likely more than 4 meters tall, is recorded as having stood on the pyramid’s summit platform — one of the most monumental single expressions of Shaiva devotion anywhere in the Khmer world. Koh Ker was inscribed as a UNESCO World Heritage Site on 17 September 2023, formally recognizing its archaeological and cultural significance; today it functions as a heritage and tourism site, valued for both its singular pyramid architecture and its brief, pivotal role at the center of the Khmer Empire.