Diyarbakır Fortress, is a historical fortress in Sur, Diyarbakır, Turkey. It consists of an inner fortress and an outer fortress.
The main gates of the fortress are: Dağ (Mountain) Gate, Urfa Gate, Mardin Gate and Yeni (New) Gate. The walls come from the old Roman city of Amida and were constructed in their present form in the mid-fourth century AD by the emperor Constantius II. They are the widest and longest complete defensive walls in the world after only the Great Wall of China (the Theodosian Walls for example are longer in length, but are not continuous)
UNESCO added the building to their tentative list on 2000, and listed it as a World Heritage Site in 2015 along with Hevsel Gardens.
