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|• McCune-Reischauer||Tŏksŏng kun|
|• Revised Romanization||Deokseong-gun|
|Province||South Hamgyong Province|
|Administrative divisions||1 ŭp, 1 workers' district, 23 ri|
It is largely mountainous, but the southern area is low-lying. The Pujŏllyŏng, Taedŏk, and Kŏdubong (거두봉) ranges pass through the county. The highest point is Hŭisabong. Major streams include the Kŏsŏch'ŏn (거서천), Konp'ach'ŏn (곤파천), and Tongp'allyŏngch'ŏn (통팔령천).
Temperatures are typically quite low. About 89% of the county is forestland, of which some 70% is coniferous. Thanks to this, lumbering is an important local industry.
The local economy is centred on manufacturing, although agriculture also plays a role. Manufacturing accounts for 90% of local production. Local crops include maize, soybeans, and potatoes; these are chiefly grown along the valleys. There are also orchards and silkworm farms. Mining is supported by deposits of iron ore, gold, fluorspar, and magnetite. Hydroelectric power stations can also be found in the county.
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