Cholsan County is a kun, or county, in North Pyongan province, North Korea. It occupies the Cholsan Peninsula, which juts into the Yellow Sea. Cholsan borders Yomju and Tongrim to the north, and is bounded on all other sides by water. The terrain is dominated by rolling hills, seldom exceeding 300 m; the highest peak is Yondaesan at 393 m. The offshore island of Kado enjoys similar terrain, with Yondaebong reaching 335 m.