Classification :  Nationally Designated Cultural Assets
Designation Number : historical relics #446
Location : san1-1 and 8 lands, Jeongyang-ri, Yeongwol-eup
Designated Date : 2003. 6. 2

Jeongyang Hillfort is on the top of Gyejoksan Mt.. It takes about 40 minutes along the ridgeline of the mountain toward southeast from Yeongwol Thermoelectric Power Plant in Jeongyang-ri, Yeongwol-eup. Jeongyang Hillfort was built as a part of Southward Plan of Goguryeo.

This Hillfort is a high peak type. It's outer parts are high and the center is comparatively low. It's built with clay slate using natural stones. Yeongwol, the upper part of Namhangang River, was the center of strife of the Three Kingdoms with Danyang, Chungbuk. Taehwa Hillfort, Daeya Hillfort, Ondal Hillfort, Wantaek Hillfort, and Goseong are connected with Jeongyang Hillfort in the center of them. In the part of relics of Yeongwol in "Sinjeung Donggukyeojiseumgram", it's written . In the part of site of Hillfort of Yeongwol in "Daedongjiji", it's recorded . It's also inscripted in "Daedongyeojido".

The diameter of inner fort is about 1,060m, and the length of outer fort is 570m. The total connected length of the wall of the hillfort is 1,630m. The west gate seems to be the front gate. All east gate, south gate, and north gate are preserved well. Some parts of it has been collapsed, but it's mostly well preserved. Both names of north gate still has their original shape. The fortress has inner fort, outer fort, and blocking wall. The doors were built to be hanged. On the outer side of where a wall is noticeably crooked, chiseong and gokseong are used like gangnus. Assuming based on structure of the Hillfort and excavated remains from here, it was already built in the late 5th century to the middle of 6th century, when the Three Kingdoms were fighting over Hangang River area. It was repaired time to time but it accomplished its mission as a Hillfort until the early Joseon Period.

[References]
Hanrim University Museum, 1985, volume on Yeongwol-gun;
Hanrim University Museum Gangwon-do Yeongwol-gun, 1995,;
Yeongwol-gun, 1995; Chungbuk University Central Culture Research Institue in Yeongwol-gun, 2000, .