Ancient CivilizationsRadar reveals vast medieval Cambodian city: study Posted on April 2, 2021 by Administrator Archaeologists using radar imagery have shown that an ancient Cambodian settlement centered on the celebrated temple of Angkor Wat was far more extensive than previously thought, a study released Monday said. The medieval settlement surrounding Angkor, the one-time capital of the illustrious Khmer empire which flourished between the ninth and 14th centuries, covered a 3,000 square kilometer area (1,158 square miles).