Usan-do

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:

Joseon map(1530)

Joseon map(1530): Ulleungdo (鬱陵島) and Usan (于山島)

Kim Jeong-ho "Daedongyeojido" (1861)：Ulleungdo (鬱陵島) and Usando(于山)

Kim Jeong-ho "Daedongyeojido" (1861)：East of Ulleungdo (鬱陵島) and Usando(于山)

A map by Korean Empire: Ulleungdo (鬱陵島) and Usan(于山)