In "Study on the Governing Structures of Gaichi"(1943) written by Tansho YAMAZAKI, Korea, Taiwan, the Kwantung Leased Territory, the South Sea Islands and Sakhalin were treated as Gaichi.
山崎丹照『外地統治機構の研究』（1943年）は朝鮮・台湾・関東州・南洋群島・樺太を外地とした。