'Donghae' is a name that Koreans have been using for over 2,000 years, and can be found in various sources and maps such as "Samguksagi" Dongmyeongwang, Gwanggaeto Daungwolbi, "Paldo gun", " On the other hand, the name "Sea of Japan" is claimed to be the first name used by Matteo Ricci in the "Gonyeonjeongjeondo" in 1602. The Japanese did not perceive the name of the East Sea as "Sea of Japan" It is proven. In particular, Japan presents the results of a survey of Western highlands that the use of the "Sea of Japan" in the 19th century has increased, and claims that the name "Sea of Japan" was established in the 19th century. However, The fact that many of the maps produced in Japan at the time pointed to the East Sea as "Joseon Sea" shows that the name "Sea of Japan" was not even established in Japan.
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