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.
A defense line may be based on natural difficult terrain features, such as rivers or marshes, mountain ranges, or coastlines; temporary field fortification works such as trenches; and/or more permanent fortifications such as and .
List of defense lines
Some notable defense lines include:
Historical
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Great Wall of China, China
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Sassanian defense lines
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Defense lines of the Netherlands
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Median Wall (before 401 BC)
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Limes Germanicus, Germany
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Hadrian's Wall, United Kingdom (122)
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Antonine Wall, United Kingdom (142)
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Offa's Dyke, Wales (early 5th century)
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The Pale, Ireland (late 12th century)
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Serpent's Wall, Ukraine
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The ()) on the southern and eastern borders of the Tsardom of Russia
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Western Russian fortresses, Russia
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Civil War Defenses of Washington, United States
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Victoria Lines, Malta (1875)
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Hindenburg Line, France (1916)
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Maginot Line, France (1929)
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Schuster Line, Luxembourg
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Metaxas Line, Greece (1936-1941)
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Siegfried Line, Germany
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Mannerheim Line, Finland (1939–1940)
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K-W Line, Belgium (1939)
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Salpa Line, Finland (1940)
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Gothic Line, Italy
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Winter Line (Gustav, Bernhardt and Hitler Lines), Italy (1943-1944)
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Panther–Wotan line, Russia (1943)
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Pusan Perimeter, South Korea (1950)
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McNamara Line, South Vietnam (1966)
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Bar Lev Line, Sinai Peninsula (1973)
Modern
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Russia–Ukraine barrier, Ukraine
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Wagner Line, Ukraine
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Muhamalai FDL, Sri Lanka
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Nagarcoil FDL, Sri Lanka
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Baltic Defence Line, Baltic states
Notes
