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Huge Japan Map

A huge map of Japan.

After some investigation Civ5 may not be copying map files to the proper directory after you enable them in the mod screen. To correct this issue manually, browse to your Civ5 MODS folder which will likely be in My Documents something like this: C:\...\Documents\My Games\Sid Meier's Civilization 5\MODS\Huge Japan Map\
You can then copy "Huge_Japan.Civ5Map" to the Maps folder in the same directory, which will be something like: C:\...\Documents\My Games\Sid Meier's Civilization 5\Maps\
This should enable the map for Single Player.