干山島（旧独島名）はウルルン島の東海岸のすぐ沖に位置していること示す18世紀後半の地図。 干山島は一つの島となっているが、竹島Liancourt Rocksは２つの島からなり、ウルルン島から９２ｋｍも離れている。 This old Korean map showed an island labeled as "Usando" (于山島 - 우산도) just off the east shore of Ulleundo (鬱陵島 - 울릉도). Koreans claim that Usando was the old name for Dokdo (Liancourt Rocks), but this map is more evidence against that claim. Liancourt Rocks is essentially two islands 92 kilometers southeast of Ulleungdo, but this map shows Usando as one island just off Ulleungdo's east shore. Usando was, in fact, the old name for Ulleungdo's neighboring island of Jukdo (竹島 - 죽도), which is about two kilometers off Ulleungdo's east shore. This map is stored in Korea's Yeongnam University Museum.