Constructed at the same time as Prasat Thom, this marker temple and pond lie on this axis passing through the middle of the south dyke of the Rahal. Prasat Khnar once housed a huge Linga which was 7m high and 4m diameter, raised on a giant pedestal (3m high and 7m square) built by assembling several blocks of sandstone, this Linga contrasts to other Lingas constructed from a single monolithic stone. The temple stands on a mount, higher than the adjacent reservoir known as Trapeang Ang Khnar. Many natural rocks around the reservoir are carved with depictions of Hindu deities including Shiva, Vishnu, Brahma, the nine planets and animals. The Linga and these holy carvings served to sanctify rain and water as it flowed into the reservoir and on into the Rahal, establishing an important relationship between the great Linga, the Rahal and Trapeang Ang Khnar. This significant feature is similar to those constructed in the 11th century in Phnom Kulen and Kbal Spean.
