Below is a map showing Usando from an 1854 text entitled "Diary of the Conquest of Joseon" (朝鮮征伐記 - 조선정벌기), published by "Keum Haeng Dang - Guk Ji Jangpan" (金幸堂 - 菊池藏板). The map shows "Cheonsando" (千山島 - 천산도) off the east coast of Korea.
More information on the text can be found HERE.
I guess 千山島 on this map was referenced from 日本辺界略図 by 高橋景保,
ReplyDeleteespecially 千山島(Thousand mountain island) nearby Wonsan元山,broughton bay(東朝鮮湾)
Gerry,
ReplyDelete"菊池氏藏板" means version of Mr. Kikuchi's property.