The Great Wall of Gorgan (also called the Gorgan Defense Wall and Sadd-e Eskandar) is an ancient defensive facility located in the Gorgan region of northeastern Iran. It consists of a 155 kilometre long, and 6 to10 metre wide wall, along the length of which are located a number of fortresses, spaced at intervals of between 10 and 50 kilometres. The wall was built during the Parthian Dynasty to protect Iran from the invasions of the northern (mostly Turkic) tribes. It was restored during the Sassanid era (3-7th centuries AD). Its construction is contemporaneous with that of the Great Wall of China, and it is second only to that edifice as the largest defensive wall in existence. Despite its scale and significance the Gorgan Wall remains virtually unknown outside Iran.
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