The limestone cliffs, which drop steeply to the south and are about 100 m high, had to be secured by a weir system to the west, north and east. At the western end of the cliff is a structure of unknown function, built of mighty cyclopean blocks. Six identical inscriptions in Assyrian language testify to Sarduri I as the builder of the complex called "Sardursburg"[1], which the locals call Madır Burçu. According to Armenian tradition, the fortress was built by Queen Semiramis (Schamiram) and was considered impregnable[2].
Source: Wikipedia