This is a grand and majestic Khmer site over a thousand years old. Built on an extinct volcano, it is originally a Hindu religious site and later became a Buddhist one. During the 15th-18th Buddhist century, several additions were made.

It is located on the edge of highway 24, 4 km away from Nang Rong district, on the path to Hin Phanom Rung castle. It is a small reservoir adjusted for sight seeing. There are shelters for relaxing. There would be a lot of birds in summer.

Prasat Sikhoraphum is located at Ban Prasat, Tambon Ra-ngaeng, It was built according to the ancient Khmer art style that corresponds to the art of the Baphuon period, which continued onto the Angkor Wat period of the 11th-12th centuries. It was a place of worship for the Hindu religion of the Shiva sect that respected Lord Shiva, who was the supreme god. Then around the 17th-18th centuries, Prasat Sikhoraphum was converted to be a temple of the Theravada Buddhist sect.