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As an aside; removing that many territories is simply too much hassle. It would require an entire re-work of the map (including provincial names and connections). The ability to remove provinces from a map in the Dom 6 map editor is renown for being a huge PITA and doesn't work properly. It bugs out and breaks provincial connections and names. Which is why the map would require a complete rework.
In theory you can only notice the dungeons even being there if you use Eyes of God, which is honestly not a big deal.
Why?