The Greater Cairo Area (GCA; Arabic: القاهرة الكبرى, romanized: Al-Qāhira al-Kubrā) is the largest metropolitan area in Egypt, the largest urban area in Africa, the Middle East, and the Arab world, and the 6th largest metropolitan area in the world. It consists of all cities in the Cairo Governorate as well as Giza, 6th of October, Sheikh Zayed City in the Giza Governorate and Shubra El Kheima and Obour in the Qalyubia Governorate, with a total population estimated at 20,901,000; area: 1,709 km2; density: 10,400/km2.