Ongmasan Mountain is located in the southern part of Boryeong with its highest point reaching 601 meters above sea level. Although the mountain encompasses the areas of Myeongcheon-dong and Nampo-myeon, it can easily be identified due to the transmission tower installed at the peak. The mountain's name is said to have derived from the legend of the last king of the Silla period and his horse that was hit with a jade arrow. The mountain has a paragliding center and a pine forest with rest spots. ...