Non Muang Kao, translates to "Mound of the Ancient City". It is a 50 ha prehistoric mound, ringed by at least two wide channels, parts of which contain water to this day. The mound itself is 300 metres in diameter and rises an impressive seven meters from the surrounding rice paddy. The only evident disturbance of the site has been the construction of a railway and a road, which destroyed the moats to the west and east of the mound. Non Muang Kao today, lies in extensive rice paddy, which stretches as far as the eye can see. The isolated location of Non Muang Kao has probably contributed to its preservation which clearly enhances its archaeological value.
Based on the recovered ceramics, Non Muang Kao appears to have been unoccupied since at least the early historic period, around 600 AD. It is expected that the site was first occupied sometime during the Bronze Age, and was inhabited through the Iron Age which began around 500 BC.
Non Muang Kao is located in Northeast Thailand, on the Khorat Plateau, about 20 kilometres from the city of Phimai in Nakon Ratchasima province. It is one of many similar sites located near the Mun River, a tributary of the Mekong.