'Donghae' is a name that Koreans have been using for more than 2,000 years, and it is mentioned in t "Samguksagi (三國史記)" edition of King Dongmyeong, the tombstone of Gwanggaeto the Great, "Eight Islands Chongdo (八道總圖)", and "Aguk Chongdo (我國總圖)" This fact can be confirmed in various sources and old maps.

On the other hand, it is claimed that the name 'Sea of ​​Japan' was first used in "The Map of All Nations" by Matteo Ricci in 1602. However, various historical documents prove that the Japanese themselves did not recognize the name of the East Sea area as the “Sea of ​​Japan”. In particular, Japan presents the results of a survey on Western ancient maps showing that the use of the 'Sea of ​​Japan' increased in the 19th century and claims that the name of the 'Sea of ​​Japan' was established in the 19th century, but according to the Japanese maps Byeongyeokdo (日本邊界略圖, 1809) and Shinjeyeojijeondo (新製輿地全圖, 1844), you can see that it is marked as the East Sea.

I saw a map on your site marking 'Donghae' Sea of ​​Japan.

Many countries are unaware of these facts and make mistakes.

This is an incorrect error and I would appreciate it if you could correct it.

Thanks for reading.