Sakchu County is a kun, or county, in northern North Pyongan province, North Korea. It lies on the Yalu River, bordering the People's Republic of China to the north. Within North Korea, it borders Changsong to the east, Chonma and Taegwan to the south, and Uiju to the west. The Kangnam Mountains rise in the southeast of Sakchu. The highest peak is Munsan, at 1046 m. The terrain overall is rugged, with only 13% of the county's area under cultivation, as compared to 80% which is forested.