wildlife which roams between two countries such as wild hog, deer, barking deer, rabbit, squirrel, gibbon and civet. 'Twin Stupas. The Twin Stupas are two red sandstone structures, 1.93 m. square and 4.20 m. high, with lotus-bud-shaped apices. Don Tuan Khmer Ruins. Built during the 10th -11th Century, the Khmer Ruins near Ban Phume Sarol () are located at , 350 meters onto the Cambodia side of the distinct watershed border ridge, at an elevation of 250 meters above sea level, 30 meters below and 350 meters southwest of the border ridge. The only road access, however, is from Thailand. Legend tells that in the past a lady known as Nang Nom Yai or Nieng Non dor (in Khmer), stopped to rest here on her way to visit a king. Namtok and Tham Khun Sri. The three-tiered waterfall, above the cave, is situated west of Sra trao close to trail to Phreah Vihear. Khun Sri Cave is of gigantic proportions and was believed to have been the accommodation of Khun Sri, a noble man who controlled rock cutting at Sra Trao at the time of the construction of Preah Vihear Sanctuary. Namtok Phu La-Ō (). Situated in Phanom Dongrak Wildlife Sanctuary, Tambon Sao Thongchai, the small waterfall turns vibrant during September to February. See also Cambodian–Thai border dispute Irridentism Preah Vihear Temple List of national parks of Thailand List of Protected Areas Regional Offices of Thailand Notes External links National parks of Thailand Dângrêk Mountains Tourist attractions in Sisaket province Protected areas established in 1998 1998 establishments in Thailand