Wikipedia
Daecheongdo
Daecheong Island is a , long and wide island in Ongjin County, Incheon, South Korea, near the Northern Limit Line. The 1953 Korean Armistice Agreement which ended the Korean War specified that the five islands including Daecheong Island would remain under U.N. and South Korea control. This agreement was signed by both DPRK and United Nations Command. Since then, it serves as a maritime demarcation between North and South Korea in the Yellow Sea (also called West Sea).
The island is from the coast of South Hwanghae Province in North Korea.