Presented by the East Asian Library at Berkeley, in collaboration with David Rumsey and Cartography Associates, this Web site features 210 high-quality scanned maps from the Mitsui Library collection, which was originally purchased in 1949. The most compelling feature of this online collection is the technology deployed on the site that allows users different levels of functionality and interaction with the maps. Users may elect to use the standard Insight browser provided here (which still has a zoom feature and several others), or they can elect to use a special GIS browser that overlays current geospatial data over many of the historical maps. In several different formats, the maps available online date back to the 17th century and cover virtually ever major urban area in Japan. The maps are uniquely beautiful and will be the source of great interest to anyone with an interest in cartography or Japan.