Title: Azerbaijan (Iran)
Content:  Azerbaijan's major cities are Tabriz (the capital of East Azerbaijan), Urmia  (the capital of West Azerbaijan), Zanjan  (the capital of Zanjan Province), Ardabil  (the capital of Ardabil Province) and Major cities non-capital of Province's Azerbaijan are Khoy and Maragheh.
Title: Outline of Azerbaijan
Content: Capital of Azerbaijan: Baku ; Cities of Azerbaijan Municipalities of Azerbaijan
Title: Baku
Content:  Baku (, ; Bakı ) is the capital and largest city of Azerbaijan, as well as the largest city on the Caspian Sea and of the Caucasus region. Baku is located 28 m below sea level, which makes it the lowest lying national capital in the world and also the largest city in the world located below sea level. Baku lies on the southern shore of the Absheron Peninsula, alongside the Bay of Baku. At the beginning of 2009, Baku's urban population was estimated at just over two million people. Officially, about 25% of all inhabitants of the country live in 
Title: List of cities in Azerbaijan
Content: Agdash ; Aghjabadi ; Agstafa ; Agsu ; Astara ; Aghdara ; Babek ; Baku – the capital and largest city of Azerbaijan ; Balakən ; Barda ; Beylagan ; Bilasuvar ; Dashkasan ; Shabran ; Fuzuli ; Gadabay ; Ganja ; Goranboy ; Goychay ; Goygol ; Hajigabul ; Imishli ; Ismayilli ; Jabrayil ; Julfa ; Kalbajar ; Khachmaz ; Khankendi ; Khojavend ; Khirdalan ; Kurdamir ; Lankaran ; Lerik ; Masally ; Mingachevir ; Nakhchivan ; Naftalan ; Neftchala ; Oghuz ; Ordubad ; Qabala ; Qakh ; Qazakh ; Quba ; Qubadli ; Qusar ; Saatlı (city) ; Sabirabad ; Shahbuz ; Shaki ; Shamakhi ; Shamkir ; Sharur ; Shirvan ; Siyazan ; Shusha ; Sumgait ; Tartar ; Tovuz ; Ujar ; Yardimli ; Yevlakh ; Zaqatala ; Zardab ; Zangilan   There are 77 urban settlements in Azerbaijan with the official status of a city (şəhər): 
Title: Azerbaijan
Content:  Azerbaijan (, ; Azərbaycan ), officially the Republic of Azerbaijan, is a country located at the boundary of Eastern Europe and Western Asia. It is a part of the South Caucasus region, and is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia and Turkey to the west, and Iran to the south. Baku is the capital and largest city. The Azerbaijan Democratic Republic proclaimed its independence from the Transcaucasian Democratic Federative Republic in 1918 and became the first secular democratic Muslim-majority state, taking its name from the adjacent region of northwestern Iran for political reasons. In 1922, the country was incorporated into the Soviet Union as the Azerbaijan SSR. The modern Republic of Azerbaijan proclaimed its independence on 30 August 1991, shortly 
Title: Economy of Baku
Content:  Baku is the capital city of Azerbaijan. On the coast of the Caspian Sea, in the Caucasus region, it is an international junction of land and sea trade routes and the center of Azerbaijan's economic life. The city's economy encompasses a number of sectors.
Title: Outline of Azerbaijan
Content: Form of government: unitary semi-presidential republic ; Capital of Azerbaijan: Baku ; Elections in Azerbaijan ; Political parties in Azerbaijan ; Taxation in Azerbaijan Politics of Azerbaijan
Title: Agsu (city)
Content:  Agsu (Ağsu) is a city in and capital of the Agsu District of Azerbaijan.
Title: Geography of Azerbaijan
Content:  from the rest of Azerbaijan by a strip of Armenian territory, and the Nagorno-Karabakh Autonomous Region, entirely within Azerbaijan. The status of Nagorno-Karabakh is disputed by Armenia. Located in the region of the southern Caucasus Mountains, Azerbaijan borders the Caspian Sea to the east, Georgia and Russia to the north, Iran to the south, and Armenia to the southwest and west. A small part of Nakhchivan also borders Turkey to the northwest. The capital of Azerbaijan is the ancient city of Baku, which has the largest and best harbor on the Caspian Sea and has long been the center of the republic's oil industry.
Title: Transport in Azerbaijan
Content:  Currently, the only metro system in Azerbaijan is the Baku Metro, located in Baku, the country's capital. New plans to open metro systems in the most populated and developed cities of Azerbaijan were unveiled. Sumgayit, Nakhchivan and Ganja all plan to have subway systems in the future.

Question: What is the capital of Azerbaijan?
Answer: Baku.
City of Winds.