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The Liancourt Rocks dispute is a territorial dispute between South Korea and Japan. Both countries claim sovereignty over the Liancourt Rocks, a group of small islets in the Sea of Japan which are referred to as "Dokdo" (Korean: 독도; Hanja: 獨島) in Korean and "Takeshima" (竹島) in Japanese. North Korea also claims sovereignty of the islands. Researchers disagree on who first had administrative control over the islets due to ambiguities in early historical records and maps, partly due to changes in the names of the islands in the area over the years.