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Defense line or fortification line is a geographically-recognizable line of troops and armament, fortified and set up to protect a high-value location during an armed conflict.
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 more permanent fortifications such as fortresses.
List of defense lines
Some notable defense lines include:
References
Defense line Wikipedia(Text) CC BY-SA