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|• McCune-Reischauer||Hamju kun|
|• Revised Romanization||Hamju-gun|
|Province||South Hamgyong Province|
|Administrative divisions||1 ŭp, 36 ri|
The county's highest point is Norabong. The chief river is the Sangch'ŏn River (상천강). Aside from the coastal area, Hamju is mountainous throughout. It is cold, but is distinguished by the occurrence of foehn winds in the upland areas. Due to this, the climate is milder than the Yellow Sea coastal regions.
Agriculture and fishery
In the level regions, a large amount of rice is produced. Most agriculture in the county is dry-field farming, with crops including Deccan millet, red beans, soybeans, potatoes, and vegetables. Silkworms and livestock are also widely raised, and fishing is carried out along the coast.
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