For instance, the government stated, 'Korea, Taiwan, the Kwantung Leased Territory, the South Sea Islands were considered as Japan's territories' in "Colonial handbook" issued by Takushoku Office in 1923 (The handbook also mentioned about the land appurtenant to South Manchuria Railways).
例えば大正12年刊行の拓殖事務局『植民地要覧』では朝鮮・台湾・樺太・関東州・南洋群島を「我が植民地と解せらるる」としていた（同書では南満州鉄道付属地も扱っている）。