one of the best fortification works of ancientry, basaltic andesite, one of the hardest rocks in the world. The main gate is composed by well-hewn stone blocks with a perfect fit of the connecting surfaces. The total length of the fortification is very big, as it surrounds the entire land-lubber site of the rocky hill above the south end of Mandraki. The wall and the cliff delimit an area of about 130 acres total perimeter almost 2 km, while the weight of some of the stones that form the wall, reach 3.5 tonnes.