Naejangsan, Mountain summit in North Jeolla, South Korea.

Naejangsan rises 763 m on the border of Jeongeup and Sunchang County and forms the core of Naejangsan National Park, which covers 81.715 km². The park holds nine summits between 622 and 763 m, linked by a circuit trail hiked in four to seven hours. On local trail maps the main peak is marked Sinseonbong.

The mountain received designation as a national park in November 1971, leading to the protection of natural resources and the development of hiking infrastructure. This recognition helped preserve the mountain region from further development while ensuring its accessibility for visitors.

The name Naejang means that what is hidden in the mountain is infinite; the mountain was originally called Yeongeunsan after the temple Yeongeunsa. Since 1969 a song contest held by Jeongeup and the Jeongeup Culture Center has produced the popular song "Naejangsan" by Kim Yong-im, with lyrics by Go Sun-ok and music by Lee Ho-seop, which visitors may hear locally.

From Yongsan Station in Seoul, KTX trains reach Jeongeup in about 1.5 hours; buses from Seoul take about 3 hours. Bus No. 171 runs from Jeongeup to the Naejangsan bus station next to the mountain in around 30 minutes. A circuit over nine summits between 622 and 763 m takes 4 to 7 hours.

The mountain circuit includes nine distinct summits ranging between 622 and 763 meters, creating a challenging hiking route. This series of peaks makes the experience less about reaching one high point and more about traversing an entire mountain ridge.