The walled perimeter dates back to circa 650-540 BC. It has an elliptic shape320 meterslong, delimiting a surface of 11.5 hectares. Its maximum height is of 3.5 metersand has a width of 3.6 meters. The wall has two faces and internal buttress. The exterior face is built with big blocks resting over a flagstone base. Some of these blocks can weight up to 8 tons. The interior face is built by irregular lines of smaller squared stone blocks.
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