Ergani, formerly known as Arghni or Arghana, is a municipality and district of Diyarbakır Province, Turkey. Its area is 1,510 km², and its populati…Ergani, formerly known as Arghni or Arghana, is a municipality and district of Diyarbakır Province, Turkey. Its area is 1,510 km², and its population is 136,099. Ergani District is located in the administrative as the Southeastern Anatolia Region, but as a geographical region it is located in Eastern Anatolia. The mayor is Ahmet Kaya since 2019. Ahmet Karaaslan was appointed as the District Governor.