Jisho

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Wikipedia definition
1. Usan-doUsan-do is a historical name for an island in the Sea of Japan (East Sea) described in Korean records. It was part of the ancient state of Usan-guk, but its exact identity is disputed. It may refer to: Ulleungdo 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.
Read “Usan-do” on English Wikipedia
Read “于山島” on Japanese Wikipedia
Read “Usan-do” on DBpedia

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