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Five West Sea Islands (Korean: 西海五島/서해오도) refers to the five islands in the West Sea (Yellow Sea) administrated by Incheon, South Korea. They are Yeonpyeong Island, Baengnyeongdo, Daecheongdo, Socheongdo and U Island. Their positions are much closer to North Korea and their sovereignties are claimed by North Korea, but they are controlled by South Korea since the United Nations forces established the Northern Limit Line (NLL) above the islands in 1953 after the Korean War.
References
Five West Sea Islands Wikipedia(Text) CC BY-SA