The ancient town of Si Thep is located in Si Thep sub-district, Si Thep district, Phetchabun province on the high land of central Thailand which is the exchange network association of products, trade routes and cultures between the central and northeast region as they have been being important since the late pre-history till the ancient Khmer culture (8th – 18th Buddhist century).
|The outer zone is on the east of the inner zone on 2.83 square kilometers of the land and the city plan is rather rectangular and rounded at the corners. 64 historic sites are found in this area comprising many ancient ponds. There is also the exploration of other 50 historic sites out of the moat and rampart zone. Especially, the important ones are at the north of the town such as Khao Klang Nok, Prang Ruesi, a group of Khao Klang Sa Kaew and Sa Kaew, a big ancient pond. For another side on the west, Khao Thamor Rat, a unique configuration of a massive limestone mountain, is located 15 kilometers away from the outer zone of the town. It has been a landmark for the main journeys since pre-history and a major source of tool and stone bracelet invention at the foothills. Later in Dvaravati age, a limestone cave on the western east of the mountain was adapted for a place of worship in Mahayana. It was identified as in the age of 14th Buddhist century.|