The sea between Republic of Korea and Japan has two name.
East Sea and Sea of Japan.
The first one is from Korea and the latter one is from Japan.
And through negotiations, Korea and Japan decided to use both names together.
But a world map that you have used only wrote the sea as mer du sea, which is the French version of 'Sea of Japan'.
This is a very sensitive issue for our country.
I hope you to add the name East Sea.
If you do that I would appreciate you.