Tohoku University Library / Institute of Geography, Graduate School of Science, Tohoku University
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>> World Map Search
Showing gaihozu map cells on the index map of the world, you can search gaihozu visually. You can access detailed maps and bibliographical information by clicking a paticular cell.

>> Index Map Search
On the wide-scale maps of each region, you can locate the areas covered on this database, and open detailed maps and bibliographical information by clicking a particular area on these index maps.
Also, the list of maps included in the selected area is shown simultaneously.

>> Lists of Index Data by Regions
The list of Tohoku University’s collection of 12,282 Gaihozu maps is shown here. Among them, 6,205 maps are available as graphic data on this website.

>> Keyword Search (Japanese Only)
Search in the index data by region, map title, Latitude, Longitude, and Index Number.

>> Statistics of This Database
The number of maps and graphical data registered by regions as well as the list by the areas.

>> Gaihozu Links
Links to the Gaihozu-related websites.

About this website

- This website provides graphical data and bibliographical information of “Gaihozu”.
- The creation of this site was conducted by the Gaihozu Digital Archive Creation Committee” under the funding by KAKENHI (Grant-in-Aid for Publication of Scientific Research Results), Japan Society for the Promotion of Science.
- About the Gaihozu Digital Archive
- Use and Copyrights of this website

About Gaihozu:
Maps of the Areas outside the Japanese Territory Prepared by Former Japanese Army

Between Meiji era and the end of World War II, map production in Japan was conducted by the Land Survey Department of the General Staff Headquarters, the former Japanese army. Not only did the Department produced maps of Japanese territory, it also created maps of the areas outside the Japanese territory, which were referred to as “Gaihozu”. Presently, “Gaihozu” include the maps of the former Japanese territories, and are predominantly in scales ranging from 1:25,000 to 1:500,000. Their geographical coverage stretches to Alaska northward, covering areas of U.S. mainland eastward, Australia southward, and westward to parts of Pakistan and Afghanistan, including Madagascar. The methods of the map production varied from surveys by the Japanese survey squads, reproducing maps produced abroad and secret surveys by sealed order.
     As these maps were complied for military necessity, most of Gaihozu were classified as secret; and after the war, many of them were either destroyed or confiscated. Thanks to the efforts of then researchers, some of Gaihozu, however, were delivered to institutions such as Tohoku University. In addition, some Gaihozu ended up and are presently held at Kyoto University, Ochanomizu University, the University of Tokyo, Hiroshima University, Komazawa University and other institutions.
     Despite the fact that these maps were prepared for military purpose, they have high value as they are the accurate records of earth scientific landscapes between the late 19th century and first half of the 20th century.

--> About Gaihozu  (in details)

Gaihozu Index Map 1
Gaihozu Index Map 2
Gaihozu/Indonesia 1 Gaihozu/Indonesia 2
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