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Sea of Japan is globally established standard name. We had been using this global standard name over 200 years and the name had been prevailed all over the world, on the World Map and Chart, hydrographic reports and magazines.  Unification of global standard name enable to avoid confusion of  geography information.

　These days fascist South Korean who brainwashed ethno-centristic offensive education in their country, Korean distorts to claim that the name of Sea of Japan is originates from the legacy of  Japan's Imperialism and Korean annexation of 1910.  But, it is completely distorted propaganda by South Korean, which are aimed for anti-Japan brainwash propaganda.


The fact is that the name of "Sea of Japan" is the result of Ages of Voyage of discovery and Expedition around Sea of Japan e.g. La Perouse, R.W.Broughton ,and I.Krusenstern and improvement of hydrographc studies information by their experiences. To denial the naming of Sea of Japan means ignoring and denial of those explorer's experience and efforts, process ,and  history.

In addition, I will advice Korean who believe brainwash propaganda. Korean should rename today's TongJoseonman東朝鮮湾（East Korean Gulf）.a.k.a Broughton Bay  to "East "Korean" Sea"  if they want. Iit is Nonsense that Korean insist rename of Sea of Japan.

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Only Korean claims the name of Sea of Japan with distorted story.
Koreans claims with distorture that "Sea of Japan" is original from Colonial or expansionism name.You can easily realize the process of being international standard of Sea of Japan.
"What is “LIMITS OF OCEANS AND SEAS” (S-23)”？"defenition of "Sea of Japan"
"Sea of Japan" contains country name "Japan", so it is irregular and unproper name for Oceans and Sea?   Is it true or not?  Is it not good way ?


How the "Sea of Japan" become global standard name on hydrographic studies?
Checking those process you can understand the name of "Sea of Japan" is never Colonialist name and you can find Korean claims is filled up with distorture.

European arrival on China and Japan. Various name. Mer Cin, Ocean Orientales, Sea of Japan.


Du Halde and D'anville. 1720's-1780's Various name, Sea of Corea, Oriental Sea, Sea of Japan and so on.
The new Geographic knowledge and information by French missionary ,bring back from  China gives huge impact of gepgraphic studies in Europe.  So the Map become more rich improvment which Korea got to be recognized as a peninsula than Orterius's designs map which recognized it is an island. On this era, temporary the name of "Sea of Corea" increasing the number. but. at the same time the name of "Sea of Japan " also used in various maps.


Age of Voyage of Discovery around Sea of Japan  1780-1830 Sea of Japan become global standard.
Checking the "place of name" by explorers and navigators who they sail around Sea of Japan and coast of Corea, e.g. La Perouse, Broughton, Basil hall, Gazlef, and so on. They established the global standard name of "the Sea of Japan" and "Strait of Corea". In addition, they established the name of Broughton bay-Korean Gulf.  The name of "Sea of Corea"had already been extinct around 1820-30's.


The Process Mer Du Coree become Broughton Bay, TongJoseonMan today.

Hidrographic magazine ,and Admiraｌy Chaｒt and Sea of Japan, Strait of Corea, and Brougthon bay. 1850's~
It is already establieshed each hydrographic studies place of name e.g. Sea of Japan, Strait of Korea, and Broughton Bay.
They succeed the recognization of those explorer's around 1780-1830's.  The name of "Sea of Corea"had already been extinct on 1850's which hydrographic magazines become rich in information.


Korean use the name of "Sea of Japan" by their choice without being forced by Japan.Korean use the name of "Sea of Japan" in various Geography textbooks, magazines, and reports before annexation. 1880-1910

International organization related to Hydrogeographic studies, they use "Japan" name on Sea of Japan.
Ocean name on the GEBCO hydrographic chart from 1904-2004

Ediition (year)	East(China) Sea	Yellow Sea	Str of Korea	Broughton bay	Sea of Japan
GEBCO vol.1 (1904)	nil	nil	nil	nil	Bassin du Japon
GEBCO vol.2(1912-27)	Mer de Cin Orientale.	Mer Jaune	Det de Tsushima	nil	Mer Du Japon
GEBCO vol.3 (1932-55?) Uncompleted
GEBCO vol.4 (?)
GEBCO vol.5 (1979)	East China Sea		nil	nil	Japan Sea
GEBCO vol.6 (2004)	East China Sea		nil	nil	Sea of Japan

 View a larger version of the GEBCO world map (JPEG form): full resolution (32.5 MB) or reduced resolution (3.6 MB)


Antique Map Digital Archive survey result for Sea of Japan, Strait of Corea and Broughton Bay.
(Check Excel file inside each links)
By me
By Japanese govement http://www.mofa.go.jp/policy/maritime/japan/#5
It explains Sea of Japan is already established before annexation of Korea in 1910. It was early 19th century.


Resources;
MOFA: The issue of Sea of Japan
Japan Coast Guard; Naming of Japan Sea

Website for reserch on Sea of Japan, or Takeshima Liancourt Rocks

International Hygrographic Organization.

USGN BGN Standards.Serch Englie of BGN　Standard/Conventonal/Variant]


Templates Please advice your antique map information which you found.

Sea of Japan Video




Image:World map pol 2005-fr.svg and from IHO 23-3rd: Limits of Oceans and Seas, Special Publication 23, 3rd Edition 1953, published by the International Hydrographic Organization.
http://upload.wikimedia.org/wikipedia/commons/2/2e/Oceans_and_seas_boundaries_map-fr.svg

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Korean ethno-centristic fascist education to their school kids to support and justify thier future militarism expansioinism by Korean.