A few days ago I discovered this map on the MapPorn site, and I think it is interesting enough to share it.
Especially that one where you can find region from one of the best-known and one of the best 18xx games which is 1889: History of Shikoku Railways.
The whole map:
And map from 1889 looks like that (bigger version):
and the original map:
Not all railway lines were built at that time, look at the legend:
You can also compare map from 1890 – Osaka region (bigger version):
with this one:
but there are so many other games with the regions of Japan:
I would like to know all of them one day 🙂
Maps from 1889 and 1890 games come from BGG and you can find them there in printable version.