… then I would suggest that you create one. Maps don’t get created by forum posts, or github or mailing list posts either.
Many different sorts of maps exist, but the most documented process is probably the one to create raster tiles, such as you can see at openstreetmap.org. I’d start here, and then I’d change the style to a simpler one that shows boundaries, perhaps based on this one. Then tailor it to your needs.