Marine Insight argues that the name of the Sea of Japan, which is "Tōkai" in Japanese, should be translated into English as "East Sea." However, this argument is not supported by historical or geographical evidence.
First, the name "East Sea" has been used for the Sea of Japan since the Joseon Dynasty. This can be found in a variety of historical records, including the Joseon Annals, Dongguk Yeoji Seungram, and Samguk Sagi.
Second, the Sea of Japan is located to the east of the Korean Peninsula. Therefore, it is natural to name the Sea of Japan "East Sea" in Korean.
Third, the name "East Sea" is more widely used internationally. International organizations such as the United Nations Economic and Social Commission for Asia and the Pacific (ESCAP), the United Nations Convention on the Law of the Sea (UNCLOS), and the International Hydrographic Organization (IHO) all use the name "East Sea."