Historical Maps 歴史地図
Japanese Maps of Tokugawa Era University of British Columbia's 275 maps are veiwable.
国会図書館絵図検索 535 historical maps are searchable, some with images.
Complete Survey of the Japanese Coast 大日本沿海輿地全図
The first geographical survey maps of Japan, made by Tadataka Ino, and often known as the Ino maps 伊能図. This site provides digital images of 43 sheets, as well as options to view the entire map (some sheets have been lost) and to zoom in. There is also a comprehensive geographical name index including old, modern, and natural place names. Created by the National Diet Library.
Topographic Map of Japan, 1/25,000 scale ウォッちず 国土地理院地図閲覧サービス
Offered by the Geographical Survey Institute; Map of Japan in 1/25,000 scale is viewable.
Harvard Geospacial Library The site allows to download geographic data for use with GIS software.
Japan GIS Resources via China Historical GIS