Usan-do

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Usan-do (Korean: 우산도, 于山島) 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.