Provinces of Japan.svg

Author: Ash Crow
Source: https://commons.wikimedia.org/wiki/File:Provinces_of_Japan.svg
License: Creative Commons Attribution 2.5 Generic (CC BY 2.5)
License URL: https://creativecommons.org/licenses/by/2.5/

Use in this game:
The 1280-pixel preview was converted to WebP. The game displays it with
transparency, sepia colour treatment, and horizontal layout adjustment.
The original map shows boundaries of the former Japanese provinces.

This attribution applies to the map asset. It does not state that the
independent game code, text, numerical settings, or UI are authored or
endorsed by the map author.