Prasat Yeai Poeun Group comprised a total of 22 sanctuaries (5 have octagonal shapes) with two wall rampart, and was built of brick, masonry, laterite and sandstone in rectangular from in 7th century (600-635) during the reign of Isanavarman I to dedicated to Shiva. They were built on a hill with Gopura from the eastern and western entrances joining to an outside laterite rampart. The inner rampart reached by gateways from the four directions and joined to the brick rampart carved in various clustering figures.