A simple deck on Japanese geography. Cards include all 47 prefectures and 9 regions (2 of which are also prefectures).
The maps are SVG files derived from the maps created by Wikipedia user Lincun.
They are licensed under
https://creativecommons.org/licenses/by-sa/3.0/us/.
Here is an example (converted to png):
http://i.imgur.com/rEnZXGR.png