I saw the term of Japan Sea, where the sea between Korea and Japan on the website.
However, I have to point out the error of the name, "East Sea", which belongs to Korea.
East Sea was named since the 6th Century. The ancient maps supported the evidence of my workds.
Unfortunately, Japan defeated Russia in 1904, and started to rule Korean peninsula.
Since then, some of Korean historical evidences and materials were deleted or corrected.
After the liberation from Japan in 1945, Korean people try to correct them.