there is also a very basic color map within the game itself. you can find it in: Shogun-Total War\Textures\campmap\ there are 2 files in there, LukMap.lbm and LukMap2.lbm. both are essentially the same map and you'll need a paint program that can display .lbm files.

there are also numerous sites where you can get geographical maps on japan, as well as historical, political and other types of maps. i'll have to look some of them up and post them here later.

K.