독도오류표기 사이버단 > 항의서한발송 > https://www.volcanodiscovery.com/earthquakes/quake-info/6240721/mag4quake-May-12-2021-SEA-OF-JAPAN.html

According to the Ministry of Foreign Affairs for South Korea, the name Donghae (동해, literally East Sea) has been used in Korea for over 2,000 years, including in History of the Three Kingdoms (三國史記, 1145), the monument of King Gwanggaeto, and "Map of Eight Provinces of Korea" (八道總圖, 1530). The first documented map to name the area the Sea of Japan was the world map drawn by the Italian missionary Matteo Ricci in China (1602) named Kunyu Wanguo Quantu (坤輿萬國全圖). No Japanese record published up to the late-18th century indicated any name for the body of water. Furthermore, South Korea has pointed out that a few 19th-century Japanese maps referred to the sea as Chōsenkai (朝鮮海, literally Sea of Joseon), including the "Simplified Map of Japan's Periphery" (日本邊界略圖, 1809) and "New World Map" (新製輿地全圖, 1844). South Korea argues there was no standard name prior to Japan's military expansion in the region in the late 19th and early 20th centuries. Additionally, it specifically states that the name Sea of Japan was not widely used, even in Japan, as late as the mid 19th century. Thus, South Korea argues that the current name reflects active promotion by Japan during a time when Korea could not represent its interests internationally. In 1992, the name "East Sea" was agreed upon in South Korea and claimed by the country for the sea during its participation in the U.N. Conference on Standardization of Geographical Names.