It would be good to make sure that the unique characters appear not only in the cities and huts, but also for some unforeseen circumstances, such as mines, caves and water bodies.
In my opinion it would be better to have the developers made it possible to separate the nations only to them, not only peculiar features when you start.
Explanation. If I draw and bring into play the Loch Ness lake, I could not get out of it a monster appear. Bermuda should disappear planes and ships.
Also interesting Magnetic anomalies, Sinkhole (failure of the land).
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