Has been declared a national park on December 31, 2534 covering an area of Khong Chiam. Si Muang Mai. And Pho Sai, an area adjacent to Laos. The Mekong River is the border line. The area of 140 square kilometers. Topography is a plateau and hills. A steep cliff as a result of separation of the earth's surface. Forest is generally dry dipterocarp forest. Have unusual characteristics sandstone scattered around the area.