These are heavily guarded borders that restrict movement through military control.
Demilitarized Zone (DMZ): An area from which weapons and military forces have been removed as part of peace agreements between conflicting parties.
Iron Curtain: A term used during the Cold War referring to the boundary that separated Soviet-dominated Eastern Europe from Western European nations not under Soviet influence.
Border Control: Government measures taken at border crossings to regulate who can enter or leave a country.
AP Human Geography - 4.4 Defining Political Boundaries
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