Khao Phra Wihan National Park (Thai: อุทยานแห่งชาติเขาพระวิหาร) is a protected natural area in Sisaket Province, Thailand, that contains numerous ruins of the 11th century Khmer Empire.

[2] The park atop Pha Mo I Daeng is the Thai gateway to ruins associated with the temple of Prasat Preah Vihear, and is generally open to everyone upon payment of entrance fees.

The International Court of Justice awarded the temple ruins to Cambodia in 1962,[3] but these are located in an area of 4.6 km² that Thailand still claims.

Thai experts found "unacceptable scientific inaccuracies" in documents presented, dissociated themselves from the group, and then published in rebuttal their own Management Plan for Preah Vihear Mountain and Its Setting.

"[I]t depends on the two sides to come together and talk," he said, suggesting that an existing joint border committee would be the appropriate place to plan a coordinated pullback.

The Management Plan says on p. 14, "Based on iconography, the figures are dated circa 10th century, or older than Preah Vihear Temple."

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.

Situated in Phanom Dongrak Wildlife Sanctuary, Tambon Sao Thongchai, the small waterfall turns vibrant during September to February.