Usan-do (, ) is a historical name for an island in the Sea of Japan described in Korean records. It was part of the ancient state of Usan-guk, but its exact identity is disputed. It may refer to: Jukdo, a Korean island 4 km east of Ulleungdo. The Liancourt Rocks, a disputed group of islets now known as Dokdo in Korea and Takeshima in Japan.
Old Korean maps of Usan-do
See also Lee Kyu-Won
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