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The East Asian Library has a collection of 172 maps drawn by European and American cartographers, dating from the early 17th to the late 19th centuries. Some of the maps focus on one or another country in East Asia, but many show all of Asia. All have been digitized and can be viewed in zoomable images that allow for examining in close detail. They can either be browsed through the collection list or viewed in chronological sequence. The latter set does not allow for zooming.
Google Maps: Asia
See Asia--and the world--through Google Maps, which allow you to zoom in and out across the continent.
Perry-Castaneda Library Map Collection
The University of Texas' Perry-Casteñeda Library offers online access to their fine collection of maps of Asia, as well as of historical maps of the Middle East.