From Corea to Quelpaert Island: In the Footprints of Kublai Khan
Page  of 218-266 attached map; Sea of Japan.
Sea of Japan: Sea of Japan
Strait of Korea: Strait of Corea
East Korean sea or gulf or Broughton Bay; Broughton Bay
Yellow Sea : Yellow Sea
this map also write it "MER DU JAPON" (Sea of Japan) the sea between Korea,tartary and Japan. Aye, this book published on 1890 , it is earlier than Japan annexed Korea on 1910. So Korean claim which "the name of Sea of Japan established under the colonial rule of Korea", is distorture.