evidence: Prasat phra Wihan (Preah Vihear) stands on the summit of Phra Wihan Hill, on the south face of the Phanom Dong Rak Range escarpment on the Thai-Cambodian border, Si Sa Ket Province. This stone sanctuary was built in the reign of King Suryavarman I around 1038 A.D. [...] In the geographical aspect,Prasat Phar Wihan stands within the Thai boundary because all small streams that come from the top of the hill run down directly into the Mun River in northeastem Thailand. Also, from the Thai border, Prasat phra Wihan is more easily accessed than from Cambodia. The local people in the Northeast normally walk up by the streams to the summit of the hill while the Cambodians have to climb up broken staircases which are too steep to climb up comfortably. Khao Phra Wihan at Muang Boran is an artificial hill with 54 meters high, 66 meters wide and 250 meters of hill slope. 684 pillars have been used to shore up the hill, 2,400 truckloads of rockfill were used to create the lofty hill. 40 rai of land mass was dug up for topsoil to cover the hill slope. The artificial hill of Preah Vihear is about one-tenth of ist original size while the prasat is smaller than its original size by half. On the top of Khao Phra Wihan provides an excellent scenary of Muang Boran.