Ongjin County, Incheon

Yeonpyeong Island or Yeonpyeongdo ( ) is a group of South Korean islands in the Yellow Sea, located about west of Incheon and south of the coast of Hwanghae Province, North Korea. The main island of the group is Daeyeonpyeongdo ("Big Yeonpyeong Island"), also referred to simply as Yeonpyeong Island, with an area of and a population of around 1,300.

Baengnyeongdo (; ), sometimes Baekryeong Island, is an island in Ongjin County, Incheon, South Korea. It is an inhabited island located near the Northern Limit Line, and is closer to North Korea than it is to the South.

administrative division of South Korea

thumb|right|The disputed maritime boundary between North and South Korea in the [[Yellow Sea: A: United Nations Command-created Northern Limit Line, 1953 B: North Korea-declared "Inter-Korean MDL", 1999

Yeongheungdo () is an island in the Yellow Sea, within the municipal borders of Incheon metropolitan city, in South Korea.

Deokjeokdo () or Deokjeok Island is the largest island of Deokjeok-myeon, Ongjin County, Incheon, South Korea.

Socheongdo () or Socheong Island is a small island in Ongjin County, Incheon, South Korea. It is part of Daecheong , centred on the larger Daecheongdo to its north; both islands are near the Northern Limit Line between North and South Korea. It is situated in the Yellow Sea, lying 200 km northwest of Incheon, 40 km southwest of the mainland of South Hwanghae, North Korea, and 200 km northeast of Shandong Peninsula, China.

five South Korean islands