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Unfun fact: the most fortified border of a European country is actually in Africa, in the Spanish colonial city of Melilla
(hexbear.net)
Two layers of electrified, barbed wire, with armed guards to keep a colony secure. Colonialism has never actually ended
Enclaves makes maps more fun. I especially love that city on the Dutch-Belgiam border where there are like 20 different tiny enclaves because back in the middle ages different feudal lords owned different fields.