International Hydrographic Organization (IHO) is deeply to this. In 1929, the IHO published a booklet called Limits of Oceans and Seas, setting up an international standard for global oceanography. But then, the East Sea on the map of the sea is used as the Sea of Japan. 1929 was when Korea was colonized by Japan. As a result, Korea was not able to participate in the process of publishing the ocean map. Therefore, only Japan's position was reflected in the international community. Korean is called East Sea has imported more than 2,000 years the name of our old map as well as other countries of old maps and even the old East Sea on the map of Japan. Enough to Sea, or other written in a long history with a name. East Sea, marking has enough evidence in many ways.