This castle with a length of almost 10 km and width of 4 km is one of the biggest natural castles of Iran. Its walls were made in forth era of geology also because of concrete and vertical rack fall of building's walls.
Also erosion because of river rising is another reason. This wall's height is 700 meters on the top area and 300 meters on the lowest area. This castle is so different from building which are called castles.
The first reason is that this castle is dug at the heart of mountain and the second reason is that other buildings are made of mud, brick and stone also they have just one water storage.
