| Ch'ŏlsan County | |
| Native Name Lang: | ko |
| Settlement Type: | County |
| Translit Lang1: | Korean |
| Translit Lang1 Type1: | Chosŏn'gŭl |
| Translit Lang1 Info1: | 철산군 |
| Translit Lang1 Type2: | Hancha |
| Translit Lang1 Info3: | Ch'ŏlsan-kun |
| Translit Lang1 Info4: | Cheolsan-gun |
| Mapsize: | 270px |
| Subdivision Type: | Country |
| Subdivision Name: | North Korea |
| Subdivision Type1: | Province |
| Subdivision Name1: | North P'yŏngan |
| Area Total Km2: | 361.4 |
| Population As Of: | 2008[1] |
| Population Total: | 85,525 |
| Population Density Km2: | auto |
| Parts Type: | Administrative divisions |
| Parts: | 1 ŭp, 2 workers' districts, 25 ri |
Ch'ŏlsan County is a kun, or county, in North P'yŏngan province, North Korea. It occupies the Ch'ŏlsan Peninsula, which juts into the Yellow Sea. Ch'ŏlsan borders Yŏmju and Tongrim counties to the north, and is bounded on all other sides by water.Ch'ŏlsan is home to the Sohae Satellite Launching Station.
Ch'ŏlsan appears as Cheolsan in South Korea's Revised Romanization and as Tieshan in Chinese records, as during its occupation by Mao Wenlong during the Manchu conquest of China.
The terrain is dominated by rolling hills, seldom exceeding 300 m; the highest peak is Yŏndaesan at 393 m. The offshore island of Kado enjoys similar terrain, with Yondaebong reaching 335 m. There are a total of 28 offshore islands, some of which are uninhabited. The coastline measure 123 kilometres in length, or 265 km if the islands are also included.
Ch'ŏlsan county is divided into 1 ŭp (town), 2 rodongjagu (workers' districts) and 25 ri (villages):
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Ch'ŏlsan enjoys a relatively mild maritime climate, with the warmest winters in North P'yŏngan. The annual temperature is 8.9 °C, with a January average of -7.9 °C and an August average of 24 °C. Annual rainfall is 900 mm.
46% of the county's land is occupied by forests, which are dominated by pine and oak. 40% is cultivated, with crops including rice, maize, and soybeans. Clams and fish are harvested from nearby waters.
Local tourist attractions include the Pansong archipelago, known for its scenery, and the Masŏn cavern (마선굴). The island of Wŏndo has been made into a nature preserve.
Educational institutions in Ch'ŏlsan include Ch'ŏlsan Advanced Technical School (철산고등전문학교).