The summit, the Phou Kao, immediately commands one's attention because of its shape,
identified in ancient times with the linga, the phallic symbol of Shiva, from which
originated its ancient name, Lingaparvata, and its reputation as a sacred hill. The permanent
spring, at the foot of the cliffs, is probably one of the main reasons that induced the ancient
rulers of the area to establish a shivaist sanctuary at this location.