http://www.theodora.com/maps/korea_north_map.html
This page uses a term ¡®Sea of Japan.¡¯ But that's a wrong term. In South Korea, calls the sea between the Korean peninsula and Japan 'East Sea'. Currently, this area is undergoing a territorial dispute over Dokdo Island. But undoubtedly, there is a Korean territorial sea. So, marking this area only to 'Sea of Japan' is not correct. I hope you change 'Sea of Japan' to 'East Sea' or 'East Sea/Sea of japan'.
More and more international organizations including UN agencies have corrected "Sea of Japan" to "East Sea". I would sincerely appreciate if your website could join this trend.