|• McCune-Reischauer||Yŏnsa kun|
|• Revised Romanization||Yeonsa-gun|
|Province||North Hamgyong Province|
|Administrative divisions||1 ŭp;, 1 workers' district, 10 ri|
|• Total||1,200 km2 (500 sq mi)|
|Population (1991 est.)|
Yŏnsa County is a kun, or county, in North Hamgyong province, North Korea. It was created following the division of Korea, being split off from Musan county in the 1952 reorganization of local government.
The land of Yonsa is high and mountainous, with even the low-lying areas more than 500 meters above sea level. The county is traversed by the Hamgyong Mountains and the Paekmu Plateau. Various streams flow through the county, including the Yŏnmyŏnsu (Chosŏn'gŭl: 연면수, Hancha: 延面水), Kuunsu (Chosŏn'gŭl: 구운수, Hancha: 九雲水), Sudongsu (Chosŏn'gŭl: 수동수), and Sŏdusu (Chosŏn'gŭl: 서두수, Hancha: 西頭水). 84% of the county is forested. The highest point is Kwanmobong (Chosŏn'gŭl: 관모봉, Hancha: 冠帽峰).
Lumbering dominates the economy of Yonsa, and there are numerous lumbermills. Wild roots and fruits are also gathered from the mountains.
There is very little agriculture, due to the lack of arable land; the farming that is carried out is chiefly dry-field farming. Yonsa is responsible for more than half of North Hamgyong's potato crop. Cultivated land makes up 4.3% of the county's area.
Yonsa lies on the Paekmu Line railroad, and is also served by roads.
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