Khao Phra Wihan National Park

Khao Phra Wihan National Park (Thai: อุทยานแห่งชาติเขาพระวิหาร) is a protected area in Kantharalak district, Sisaket province, Thailand, that contains numerous ruins of the 11th century Khmer Empire. The park lies 98 km (61 mi) south of the town of Sisaket, at the end of Thai highway 221.