Coastline and Area (As of Oct. 1, 1933) : Statistical Yearbook of Imperial Japan 52 (1933) Table 2

PERIOD: The area of Japan proper is based on the survey on October 1, 1933. The areas of Korea, South Sakhalin, Kwantung Province and South Pacific Mandate are at the end of 1931. The Area of Taiwan, at the end of 1932. SOURCE: [Surveys by the Hydrographic Department and the Land Survey Department; Statistics by government offices, overseas territories of Japan].

时期：本数据集所述的日本本土区域基于1933年10月1日的调查数据。韩国、南萨哈林、关东省以及南太平洋委任地的数据截止于1931年末，台湾的数据截止于1932年末。来源：[日本海图部与土地测量部的调查；政府机关及海外日本领土的统计数据]。