fortified line

A defense line or fortification line is a geographically recognizable line of troops and armament, fortified and set up to protect a high-value location or defend territory, which is an "area of defense".

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Wikimedia, Wikidata
defence line; defense line; defensive line; fortification line
group of structures or buildings, fortification, 
fortification, 

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Location: KML, Cluster Map, Maps,

Frameless

Bad Münstereifel, Stadtbefestigung, Werther Tor-20160606-005

Fortifications and Caucasus mountains at Gunib, Republic of Dagestan

Podnožje nemškega stražnega stolpa na Katarini pri Ljubljani

Trincerone monte zugna

Collection of photos to be used in the Glomma Line article on Wikipedia.

Type	Subtype	Date	Description	Notes	Source
commons	image		Bad Münstereifel, Stadtbefestigung, Werther Tor-20160606-005		Commons
commons	image		Fortifications and Caucasus mountains at Gunib, Republic of Dagestan		Commons
commons	image		Podnožje nemškega stražnega stolpa na Katarini pri Ljubljani		Commons
commons	image		Trincerone monte zugna		Commons
commons	image		Collection of photos to be used in the Glomma Line article on Wikipedia.		Commons