|• Revised Romanization||Gyeongheung-gun|
|Province||North Hamgyong Province|
|Administrative divisions||1 ŭp;, 3 workers' districts, 12 ri|
|• Total||920 km2 (360 sq mi)|
|Population (1991 est.)|
The county borders the People's Republic of China to the northeast. With the exception of the southwest, it is dominated by low hills, with occasional plains. The highest point is Songjinsan (1,146 m (3,760 ft)). The dominant river is the Tumen, which separates the county from China. The level ground along the Tumen is developed, but approximately 80% of the county is forested.
Mining, particularly coal mining, is the chief industry in Undok, where lignite is found; Undok is the site of the Aoji Coal Mine. In addition, farming and livestock raising are widespread. The chief crops are maize, rice, soybeans, and potatoes. The Aoji Chemical Factory is located in the county as well.
Under Joseon period "Kyunghung", the ancient name of Undok, was one of the six post/garrisons (Chosŏn'gŭl: 육진; hancha: 六鎭) establish under the order of King Sejong the Great of Joseon in 1433, to safeguard his people from the hostile Chinese and Manchurian nomads living in Manchuria
- Lee Gyung-Rok (Chosŏn'gŭl: 이경록; hancha: 李慶祿) the prefect of Kyŏnghŭng (Chosŏn'gŭl: 경흥 부사; hancha: 慶興府使)
Third-level administrative divisions
Undok County is divided into 1 town ("Ŭp") 12 villages ("Ri") and 3 worker's districts ("Rodongjagu").
- Location of the four forts and the six posts
- (Korean) In Korean language online encyclopedias: