The Korean Custumal Gazetteer comprises the results of research conducted primarily by the Office of the Governor-General of Korea at the outset of Japan's colonial rule in 1910 to serve as the basis of a thorough analysis of Korean society. Topics of fieldwork research included social organizations and groups, Korean history, urban development, climate, cultural assets, and the etymology of place names. This compilation of reports and supporting materials from over 460 sources has been arranged into a 400-volume compendium. It is available both in print and online as a digital searchable database.

This compilation collects studies of scenic historical sites and major public documents, statistics and photographs from local administrative entities, especially local gazetteers and geographic gazetteers compiled and edited by people of noble aspirations or prominent figures, as well as information about Korean geography, customs and history from studies conducted by Japanese colonial authorities and administrative institutions, such as the Office of the Governor-General of Korea. These materials are of considerable help in understanding the Korean peninsula today.

• Japanese fieldwork research records regarding the geography, customs and history of the Korean peninsula.
• Collection of studies of scenic historical sites and major public documents, statistics and photographs from local administrative entities.
• Extremely important reference material for research pertaining to near-modern China, Japan and Korea.