The USC Digital Library has an Asian Maps Collection with representations of East and Southeast Asia and a Sea of Korea (the body of water between Japan and Korea) map collection.

“The Sea of Korea Map subcollection consists of original maps, dating from 1606 to 1895, in English, French, Japanese, Korean, Dutch, Latin, German and Russian. The subcollection was formed by digitizing the combination of two private collections (David Lee and Shannon McCune) comprised of 172 maps. Together, they help to illustrate how the West’s image of East Asia evolved over the course of the 17th, 18th, and 19th centuries.”