line of fortifications

A line of fortifications is a connected series of defensive structures, such as walls, trenches, and strongpoints, designed to protect a territory or position by forming a continuous or coordinated barrier against attack.

Observed surface forms (24)

• fortified complex ×6
• military defensive line ×5
• ancient citadel ×4
• city wall ×4
• fortified city ×4
• section of the Great Wall of China ×4
• fortification line ×3
• World War II fortification ×2
• German defensive line ×1
• Great Wall pass ×1

• Roman defensive fortification ×1
• Roman frontier fortification ×1
• Roman frontier system ×1
• ancient defensive fortification ×1
• border barrier ×1
• defensive fortification ×1
• defensive fortification line ×1
• defensive military infrastructure ×1
• defensive military structure ×1
• defensive wall ×1
• fortified area ×1
• fortified artillery work ×1
• frontier wall ×1
• military barrier ×1

Instances (43)

• Bombay Castle via concept surface "fortified complex"
• Great Wall of China via concept surface "defensive wall"
• Westwall via concept surface "defensive fortification line"
• Maginot Line
• Acropolis of Athens via concept surface "ancient citadel"
• Iron Curtain via concept surface "military barrier"
• Derbent via concept surface "fortified city"
• Siegfried Line via concept surface "fortification line"
• San Juan city walls via concept surface "city wall"
• World War I military fortifications via concept surface "defensive military structure"
• Gustav Line via concept surface "German defensive line"
• Antonine Wall via concept surface "Roman frontier fortification"
• Kremlin via concept surface "fortified complex"
• Mannerheim Line via concept surface "fortification line"
• Theodosian Walls via concept surface "city wall"
• Fortified Sector of Thionville via concept surface "military defensive line"
• Berlin Wall via concept surface "border barrier"
• Chellah necropolis via concept surface "fortified complex"
• Valletta via concept surface "fortified city"
• Fortified Sector of Haguenau via concept surface "military defensive line"
• Long Walls via concept surface "ancient defensive fortification"
• Hadrian's Wall via concept surface "Roman defensive fortification"
• Summa, Karelian Isthmus via concept surface "fortified area"
• Erbil via concept surface "ancient citadel"
  surface form: Erbil Citadel
• Badaling via concept surface "section of the Great Wall of China"
• Limes Germanicus via concept surface "Roman frontier system"
• Maginot
  surface form: Maginot Line
• Citadel of Damascus via concept surface "fortified complex"
• Oxford city walls via concept surface "defensive fortification"
• World War II defences via concept surface "defensive military infrastructure"
• Tower of David via concept surface "ancient citadel"
• Simatai section via concept surface "section of the Great Wall of China"
• Byrsa Hill via concept surface "ancient citadel"
• Nuremberg City Walls via concept surface "city wall"
• Historic Fortified City of Briançon via concept surface "fortified city"
• Busan Perimeter via concept surface "military defensive line"
• Jinshanling section via concept surface "section of the Great Wall of China"
• Mutianyu section via concept surface "section of the Great Wall of China"
• Carcassonne via concept surface "fortified city"
  surface form: Cité de Carcassonne
• Jiayuguan Pass via concept surface "Great Wall pass"
• Valère Castle via concept surface "fortified complex"
• Ouvrage Schoenenbourg via concept surface "fortified artillery work"
• Buonconsiglio Castle via concept surface "fortified complex"