This is a copy of the ¡°Dongguk Daejeondo (Great Map of Korea)¡±made by Jeong Sang-gi (1678-1752) in 1757. The Ahn Yong-bok incident triggered an interest in Ulleungdo and the geographic knowledge of the area is accurately reflected on the map as Usando (Dokdo) is to the east of Ulleungdo. In the maps published during the 16th and 17th centuries, the locations of Ulleungdo and Dokdo were reversed. On maps of the 18th century such as this one, Ulleungdo and Dokdo are placed correctly.