2000 years ago, our race is the East Sea(Mar de Este) as a name that started used the name of a country named Japan has officially named eighth century, Japan, a time when more than 700 years and first name be used. So the East Sea(Mar de Este) can do that with the historical legitimacy compared to the Sea of Japan(Mar de Japo'n).

Since the East Sea(Mar de Este) region is a sea area adjacent to four countries including South Korea, North Korea, Japan, and Russia, so it is not correct to name the sea area according to the national number of one of the countries concerned. And it is necessary to find a name that all of the countries concerned can agree on. If this is not possible, it is appropriate to write the name used by the country concerned. The United Nations Conference on the Standardization of Geographical Names, which deals with the standardization of geographical names, also recommends that, in the event of a dispute over geographical names, it is recommended to be provisionally attached until an agreement between the relevant countries is reached. Therefore, from the perspective of international norms on geographical names, the 'East Sea'(Mar de Este) should be used with the Sea of ​​Japan(Mar de Japo'n).

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