Great Wall of Gorgan: OSL dating of part of the wall
The Great Wall of Gorgan in Northern Iran was around 200 km long from the Elburz Mountains into the south-east of the Caspian Sea and inculded over 33 forts. A canal at least 5 m deep, conducted water along most of the wall. The main research questions included how, when and why did people construct a wall of such enormous dimensions? To make such large quantities of bricks, it was essential to have a supply of flowing water. A water canal was fed by a complex system of supplier canals that ran along most of the wall. To ensure regular water flow, the route of the canal and the wall had to have a constant gradient. To achieve such a constant gradient over more than 100 km is the most impressive evidence for the high standards of Persian engineering.


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