On June 22 of 1946, GHQ expanded the area authorized for use by Japanese fisheries operators (SCAPIN-1033). SCAPIN-1033 stipulates, “Japanese vessels or personnel thereof will not approach closer than twelve (12) miles to Takeshima (37°15' North Latitude, 131°53' East Longitude) nor have any contact with said island.” At the same time, Article 5 of the directive stipulates that, “The present authorization is not an expression of allied policy relative to ultimate determination of national jurisdiction, international boundaries or fishing rights in the area concerned or in any other area.” (Ref.1)

Explanation: The line delineating the area authorized to Japanese fishing vessels was known as the “MacArthur Line.” Also in relation to the MacArthur Line, the United States Military confirmed that disposition of territory would be done via a peace treaty. The United States Army Military Government in South Korea stated in a report issued in August of 1947 that, “[In regards to Takeshima,] final disposition of the islands’ jurisdiction awaits the peace treaty.” (Ref.2) The MacArthur Line was ultimately dissolved before the Treaty of San Francisco was effectuated.

Ref. 1: General Headquarters, the Supreme Commander for the Allied Powers (GHQ): SCAPIN-1033: AREA AUTHORIZED FOR JAPANESE FISHING AND WHALING, June 22 of 1946, (Ministry of Foreign Affairs of Japan homepage)

Ref. 2: "U.S. Army Military Government ‒South Korea: Interim Government Activities, No.1, August 1947," Pt.1, sec.1, para.18 (Shimane Prefectural Government homepage)

On April 25 of 1952, GHQ abolished the area demarcating where Japanese fishing and whaling vessels were allowed to operate.