Why can't I place a campus on a plains tile as the Vietnamese?
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I am playing as the Vietnamese. Overall, I'm trying to place a campus on a plains (1 food, 1 prod, and completely empty) within 3 tile from the city, but the game won't let me place it there.
If we look at the surrounding:
- Top side: Farm - Woods
- Middle: Mountain - (Plains) - Mountain.
- Bottom side: Mountain - Mountain
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It's because of Vietnamese ability https://civilization.fandom.com/wiki/Vietnamese_(Civ6)#Nine_Dragon_River_Delta :
All land specialty Districts can only be built on removable features