These petroglyphs (figures, pictures, and Chinese characters) were made on the rocks along the mid-stream area of Naegokcheon Stream, which is a tributary of Taehwagang River. The upper and lower sides of the rocks contain petroglyphs that differ in the content and techniques used. The upper side contains petroglyphs made by means of chiseling. The inscriptions include geometric patterns, animals, and abstract human figures. There are concentric circles, with a round figure looking like the sun at the center, four running deer next to them, and several semi-human animals. The figures with simplistic expression and symbolism appear to have been made during the Bronze Age. The lower side contains line-drawn picture mixed with Chinese characters. They include a procession of horse riders, animals including dragons, and boats. In particular, the procession of horse riders appears in three different places. The boats provide researchers with important information on the offshore activities carried out by people of the Silla Dynasty. The 800-plus Chinese characters are about the King and Queen’s visit to the place. They were presumed to have been inscribed on two occasions during the reign of King Beopheung (r. 514-540) of the Silla Dynasty. The content on the official positions and the government system makes it a precious material for those studying Silla during or around the 6th Century. The petroglyphs were made by many people over an extended period of time, providing vivid information on the life and thoughts of people from prehistoric times to the Silla Dynasty.