New Netherlands
which is a 4096x4096 scenario that covers all of the Netherlands, a good part of northern Belgium, and the northwestern part of Germany, including the heavily industrialized Ruhr area.
Based on a 8k heightmap released in 2019 by Erato, I have "smoothed" the complete terrain, added a lot of missing rivers and channels, and placed more than 700 cities, towns, and villages at their geographically correct positions.
There is a large selection of rivers and sea-going ships added, together with Polroad for coaches and cars, and Dutch and Belgian train sets together with GETS v0.6 - the latter also limits the starting date to about 1890 since there aren't enough railway coaches for the German part available for an earlier date.
The industry set is XIS but there are no industries placed on the map yet, so you can change that to something else in the scenario editor before starting a game (I'm also planning to later release a version of the scenario with industries at the proper positions, but first have to finish a customized industry NewGRF that is also in the making).
In line with my preferences, by default, industries are set to "no open/no close" and have to be manually constructed by the player in the game.
Also, the time is "fixed" and you need to manually "forward" if you like.
Generally, the user level is "experienced" and you should be prepared to first adjust the settings and NewGRF list in the scenario editor before you start a game.
A preview of the map is shown below and the scenario is already available in the content download service
I hope you enjoy playing it and would be looking forward to see some screenshots of your games here.
Some more pictures will follow below.
[Disclaimer: Since the topic of languages is a bit sensitive in the area, in particular in Belgium, I have used those encountered first in Wikipedia or otherwise more familiar to me from a German perspective - there isn't anything beyond that in the choice and if you don't like it, change it yourself in the game]