The monument known in antiquity as either the Long Walls of Thrace or the Anastasian Wall lies 65 km west of Istanbul and stretches from the Black Sea coast across the peninsula to the coast of the Sea of Marmara to the west of Silivri. The Wall is part of the additional defences for Constantinople constructed during the 5th century AD and probably continued in use until the 7th century.
Originally the Wall was around 56 km long, but less than half of the total length now survives above ground. It is best preserved in the rolling woodland of the northern sector where the Wall stands in place up to 4m in height. Associated with the Wall is a well preserved ditch, outerwork, gates and forts. As it survives it is the most monumental linear fortification dating from antiquity in continental Europe, comparable only with Hadrian's Wall in its complexity and preservation. Recent road construction and other developments associated with the expansion of Greater Istanbul are now posing a major threat to the surviving remains.
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Plan from Crow et al