In maps made by the West from the 16th to early 19th century, various titles were used including Sea of Chosun, Sea of Korea, Eastern Sea, Sea of China and Sea of Japan.

In particular, it was found that the name, Sea of Korea, was most frequently used among the various names during this period.

The region of the East Sea appeared on the world map in the early 16th century when westerners who started their exploration of the East drew maps of the region.

	Map of China / Martint / 1655: Martini(Italian priest of Societas Jesu)’s ‘Book of China Map” Specified Korea as ‘corea peninsula”
	Map of Asia / Drill / 1705: Specified East Sea as the Eastward Gulf (MER ORIENTALE) or Sea of Korea (MER DE COREE