|• Revised Romanization||Samsu-gun|
|Administrative divisions||1 ŭp, 24 ri|
|• Total||874 km2 (337 sq mi)|
On its northern border, Samsu shares the Yalu River with China. It also shares a border with the province of North Pyongan. To the south, it occupies the northern tip of the Kaema Plateau. The southern and western reaches of Samsu abound with mountains. Due to the rugged terrain, transportation is difficult.
The highest peak of Samsu is Turungbong (두릉봉, 1921 m). The chief streams are the Changjin, Chungpyong and Yalu rivers (this is probably the reason for its name, 삼수(三水), which literally means 'three rivers'). Due to its high inland location, Samsu enjoys bitterly cold winters.
The chief industries in Samsu are logging and farming. Despite the rugged terrain, rice cultivation is widespread; in addition, slash-and-burn agriculture is practiced in the high fields. Local crops include potatoes, maize, soybeans, oats and rye. The Yalu is used to ship rough logs downstream. There are also local deposits of gold ore.
The Hyesan-Manpo-Chongnyon Line railway serves the county, as do various conventional roads.
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