Yeonsan

Yŏnsan lies in the inland country of Ch'ungch'ŏng, among the plains and hills south of Mount Kyeryong. Under Koryŏ it was a county within the jurisdiction of Ungju. Its administration changed during the Joseon period: in 1646 Yŏnsan was combined with neighbouring Ŭnjin and Isan after a rebellion attributed to Yu T'ak. The region's low ground supported fields between the surrounding mountains.