http://en.wikipedia.org/wiki/Sea_of_Japan
I have found some minor different information in your website. In the map posted on this page, the ocean that is located between the Korea and the Japan is described as the "Sea of Japan," which is decided in the period of imperialism because its original name is ¡°East Sea¡± which has been used throughout history. Therefore I believe that the body of water between Korea and Japan should be described as the ¡°East Sea¡± or at least with the simultaneous use of both names; ¡°East Sea/Sea of Japan.¡±
Thank you again for your help. I look forward to hearing from you.
Yours sincerely,
Jong Yun, Bae