I found a big mistake in your map . Sea of Japan must be changed to East sea of Korea.
And Tushima Basin must to be Ulleung Basin. Dokdo is left out from your map.
We have two islands in the sea which are Ulleung and Dokdo so that it doesn't match with sea of Japan. They are our islands why we should use funny Japanese names on their islands and sea of Japan. I think "Sea of Japan" must be used in west sea of Japan. "East Sea" is all of the words for Korea, China and other countries.
So I think you must modify your map.
Thank you.