Which of these cities is sometimes called "the Mother of the World"?

Cairo (Arabic: القاهرة‎, usually transliterated as Al-Qāhirah) is a city in Egypt. The city name can be translated as the one who won. Cairo is sometimes called "Mother of the World" (Um al Dunya).

The city is the capital and largest city in Egypt. Cairo has 7,947,121 people. About 17,290,000 people live in its urban area. This makes it the biggest city of the Arab World. It also is the city with the biggest urban area in Africa

The city is on the Nile River. The city of Cairo has a hot desert climate (BWh), meaning it has a hot, sunny and dry climate a year long. The city, however, has more humidity than other cities with the hot desert climate (BWh).