Sasanian defense lines

Map showing the Sasanian Empire at its greatest extent (7th century)
Map showing Darial, Derbent, Gorgan (Hyrcania), and Basra (the defense lines of eastern borders are omitted)

The defense lines of the Sasanians were part of their military strategy and tactics. They were networks of fortifications, walls, and/or ditches built opposite the territory of the enemies. These defense lines are known from tradition and archaeological evidence.

The fortress systems of the Western, Arabian, and Central Asian fronts were of both defensive and offensive functions.

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