The following Korean map showed Usando (于山島) just northeast of Ulleungdo (鬱陵島), suggesting again that Usando was just an old name for Ulleungdo's neighboring island of Jukdo. The map also gives 100 ri for the area (地 方百里) of Ulleungdo, which matches that written in many other Korean documents. It also says that the distance to Ulleungdo was "two days travel time by sea" (水路二日程) from the mainland, which also matches what was written on several other Korean maps and in Korean documents. Since there was no travel time mentioned for Usando, we can safely assume that it was just a nearby, neighboring island of Ulleungdo, not Dokdo (Liancourt Rocks), as many Koreans claim. The date of the map is unknown, but, according to the Takeshima Research Center, HERE, it is similar to other Korean maps made in the 18th and 19th centuries.