The northwest region is particularly mountainous. The highest peak is Palbong. The chief streams are the Tongdaech'ŏn (동대천) and Sŏdaech'ŏn (서대천). The coastal region is level. The temperature differs greatly from the coastline to the plains to the mountains. The mountains contribute to giving the county a mild climate.
Administrative divisions
Hongwŏn county is divided into 1 ŭp (town), 4 rodongjagu (workers' districts) and 27 ri (villages):