Question: In term of area where does the city, in which Nada Kamel was born, rank in the world ?
Context: Yusuf Saad Kamel (Arabic: يوسف سعد كامل‎ ‎ ), born Gregory Konchellah (born March 29, 1983), was the 2009 world champion at 1500 meters, representing Bahrain after his switch from Kenya.  He specializes in the 1500 metres and 800 metres.  He was born in Narok, Kenya. Nada Kamel (born 27 August 1990 in Cairo, Egypt) is an Egyptian archer.  She competed in the individual event at the 2012 Summer Olympics. Kamel Chebli (born 9 March 1954) is a Tunisian football defender who played for Tunisia in the 1978 FIFA World Cup.  He also played for Club Africain. Danzhou () is a prefecture-level city in the northwest of the Chinese island province of Hainan.  Although called a "city", Danzhou administers a large area which was called Dan County or Danxian (儋县) until 1993.  The administrative seat and urban center of Danzhou is Nada Town, which is often colloquially referred to as Danzhou city.  Danzhou was upgraded from a county-level city into a prefecture-level city in February 2015. Robert Ozn (born Robert M. Rosen, New York City), records under the name DaDa NaDa; Broadway credits as Robert Rosen; personal nickname OZN, (pronounced "OH-zen") is a Top Five Billboard recording artist, award-winning screenwriter, producer and Broadway actor, being the vocal half of 80s synthpop duo EBN-OZN; his solo act, Dada Nada; and for his later work as co-producer and co-writer with Colin Greene of the human-rights themed feature film "I Witness" starring Jeff Daniels, James Spader and Portia de Rossi. Kamel Mosaoud or Kamel Masoud (born 2 August 1914-date of death unknown) was an Egyptian football forward who played for Egypt in the 1934 FIFA World Cup.  He also played for Zamalek SC. The title flight officer was a military rank used by the United States Army Air Forces during World War II.  It was also an air force rank in several Commonwealth nations where it was used for female officers and was equivalent to the rank of flight lieutenant.  The term flight officer is sometimes used today to describe job title positions as aircrew members. Cairo ( ; Arabic: القاهرة‎ ‎ "al-Qāhirah ", , Coptic: "Kahire ") is the capital and largest city of Egypt.  The city's metropolitan area is the largest in the Middle East and the Arab world, and the 15th-largest in the world, and is associated with ancient Egypt, as the famous Giza pyramid complex and the ancient city of Memphis are located in its geographical area.  Located near the Nile Delta, modern Cairo was founded in 969 CE by the Fatimid dynasty, but the land composing the present-day city was the site of ancient national capitals whose remnants remain visible in parts of Old Cairo.  Cairo has long been a center of the region's political and cultural life, and is titled "the city of a thousand minarets" for its preponderance of Islamic architecture.  Cairo is considered a World City with a "Beta +" classification according to GaWC. Nur Felek Kadinefendi was the first consort of Isma'il Pasha of Egypt.  She was born in Greece in 1837.  Her maiden name was Tatiana.  At a young age, she was captured during one the raids and sold into slavery.  She was delivered as a concubine to the harem of Sa'id,the Wāli of Egypt in 1852.  However, Isma'il Pasha, then not yet the Khedive of Egypt, took Tatiana as a concubine for him.  She gave birth to Prince Hussein Kamel Pasha in 1853.  She later converted to Islam and her name was changed to Nur Felek.  When Isma'il Pasha ascended the throne in 1863, she was elevated to the rank of first Kadinefendi, literally meaning first consort, or wife.  Nur Felek had a high status in the imperial palace, since she was the mother of Isma'il's second eldest son.  Isma'il's eldest son was Tewfik Pasha, son of the Turkish concubine Shafaq Nur Hanimefendi.  After the removal of Abbas II, her son Hussein Kamel became Sultan of Egypt and she became the mother Sultana, a title equivalent to Queen mother and Valide Sultan, a rank higher than the Walida Pasha, the title held by mothers of reigning Khedives like Hoshiar Kadinefendi, mother of Isma'il Pasha and Emina Ilhamy, mother of Abbas II. Kamel Nacif Borge (born 1946) is a Puebla-based Mexican businessman of Lebanese descent, born in Mexico City, known in Mexico as "El Rey de la Mezclilla" (the Denim King).  He is one of the richest men in Mexico and one of the biggest and most famous gamblers in the world.
Answer: 15th-largest