Baku is the capital and largest city of Azerbaijan, situated on the western shore of the Caspian Sea. Historically a major port and center of the oil industry, Baku blends ancient architecture with modern skyscrapers, exemplified by the walled Old City (İçərişəhər) and the futuristic Flame Towers. Its climate is semi-arid, with hot summers and mild winters, and its population exceeds two million.
1 Geography and Climate
1.1 Location and Topography
Baku lies on the southern coast of the Abşeron Peninsula, which projects into the Caspian Sea. The city center is approximately 28 meters below sea level, making Baku one of the lowest-lying national capitals in the world. The topography is generally flat, with low hills to the west and the Caspian shoreline forming the eastern boundary. The Absheron Peninsula is known for its saline soils and occasional mud volcanoes, which are geological features common to the region.
1.2 Climate Patterns
Baku has a semi-arid climate (Köppen classification BSk), influenced by its location on the Caspian Sea and the surrounding arid steppes. Precipitation is low year-round, and humidity levels are moderate due to the sea.
1.2.1 Temperature and Precipitation
Summers are hot and dry, with average July temperatures ranging from 25 °C to 35 °C, occasionally exceeding 40 °C during heatwaves. Winters are mild and relatively cool, with January averages around 4 °C to 6 °C; snowfall is rare but possible. Annual precipitation averages about 200–250 mm, with most rain falling between October and May. The city experiences around 2500 sunshine hours per year.
1.2.2 Wind Regime (Khazri and Gilavar)
Baku is known for two prevailing winds: the cold, dry Khazri (from the north) and the warm, humid Gilavar (from the south). The Khazri wind, which can reach speeds of 20–30 m/s, often brings a sharp drop in temperature and is most common in autumn and winter. The Gilavar wind, gentler and more frequent in spring and summer, moderates temperatures and contributes to lower humidity along the coast. These winds influence local shipping, outdoor activities, and the dispersion of air pollutants.
2 History
2.1 Pre‑Islamic and Early Islamic Period
2.1.1 Ancient Settlements
Archaeological evidence indicates human settlement in the Baku area since the Bronze Age. The earliest known urban center was the settlement of Baku itself, located around natural harbors and oil seeps. The city’s name is often linked to the Persian “Bād-kūb”, meaning “wind-pounded”, a reference to the strong winds that sweep the peninsula. By the early centuries CE, the area was part of the Caucasian Albanian kingdom, and later under the control of the Sassanian Empire, which built fortifications and Zoroastrian fire temples fueled by the natural gas seeps.
2.1.2 Shirvanshah Era
With the Arab conquest in the 7th century, Baku became part of the Islamic caliphate. The local Shirvanshah dynasty, which ruled the region from the 9th to the 16th centuries, made Baku a significant political and commercial center. In the 12th century, the Shirvanshahs established their capital in Baku, building the fortress walls of İçərişəhər and constructing the Maiden Tower (Qız Qalası) and the Palace of the Shirvanshahs. The city flourished as a port on the Silk Road, trading oil, salt, and textiles.
2.2 19th Century Oil Boom
2.2.1 Development of the Oilfields
The first modern oil well in Baku was drilled in 1846, pre-dating the famous Drake well in Pennsylvania. The oil boom accelerated after 1872, when the Russian Empire abolished state monopolies and opened the fields to private enterprise. Foreign investors, including the Nobel brothers (who founded Branobel) and the Rothschild family, established large-scale extraction, refining, and transportation infrastructure. By the early 20th century, Baku produced more than half of the world’s oil, earning it the nickname “Black City” due to the dense soot from refineries.
2.2.2 Urban Expansion
The oil rush transformed Baku from a modest port city into a bustling industrial metropolis. The population grew from about 15,000 in the 1860s to over 200,000 by 1900. New districts were built, including the European-style “White City” with mansions, theaters, and boulevards. The city’s architecture reflected a mix of Russian Imperial, Islamic, and Art Nouveau influences, exemplified by the Baku City Hall and Ismailiyya building. The influx of workers and entrepreneurs also brought ethnic diversity, with Azerbaijani, Russian, Armenian, Jewish, and Persian communities coexisting (though not without tension).
2.3 Soviet Era
2.3.1 Industrialization and Housing
After the Bolshevik revolution and the brief period of the Azerbaijan Democratic Republic (1918–1920), Baku became part of the Soviet Union. The new regime nationalized the oil industry and expanded it to supply industrial needs. Baku’s role as a key oil producer made it strategically important during World War II, when Nazi Germany attempted to seize the Caucasus oilfields. In the postwar decades, the Soviet authorities undertook large-scale industrialization, building new chemical plants, machine factories, and power stations. Housing projects, such as the “khrushchyovka” apartment blocks, were constructed to accommodate the growing urban population, sprawling southward along the coast.
2.3.2 Post‑Soviet Transition
Following the collapse of the Soviet Union in 1991 and the restoration of Azerbaijan’s independence, Baku experienced economic disruption, a severe housing crisis, and the painful transition to a market economy. The oil sector saw a revival in the mid-1990s with the “Contract of the Century” (1994), which opened the Azeri–Chirag–Gunashli (ACG) oilfields to international investment. Infrastructure improvements, a construction boom, and global integration followed, turning Baku into a modern capital with a skyline dominated by high-rise towers.
3 Urban Structure and Landmarks
3.1 İçərişəhər (Old City)
The Old City, a UNESCO World Heritage Site since 2000, is a walled historic quarter on the southern shore of Baku Bay. It occupies roughly 22 hectares and contains winding alleys, caravanserais, mosques, and medieval bathhouses. Its layout dates primarily from the 12th to 15th centuries, though some structures are older.
3.1.1 Maiden Tower (Qız Qalası)
The Maiden Tower is a cylindrical stone tower, about 30 m tall, located in the southeastern part of İçərişəhər. Its exact purpose and date of construction remain debated – it may have been a Zoroastrian fire temple, a defensive tower, or an astronomical observatory. The tower is a prominent symbol of Baku, appearing on Azerbaijani currency and postage stamps. According to a popular legend, a local king imprisoned his daughter there; she leaped to her death, giving rise to the name “Maiden Tower.”
3.1.2 Palace of the Shirvanshahs
This 15th-century palace complex includes the main palace building, the Divankhana (council hall), the Shah Mosque, a mausoleum, and the remains of a bathhouse. Built under the Shirvanshah dynasty, it is considered one of the masterpieces of Azerbaijani Islamic architecture, featuring intricate stone carvings, muqarnas vaulting, and glazed tile ornamentation.
3.2 Modern Baku
3.2.1 Flame Towers
Three skyscrapers completed in 2012, designed by the firm HOK, rise to heights of 190 m (two towers) and 170 m (the third). Their facades are sheathed with LED screens that simulate flickering flames, a reference to Azerbaijan’s nickname “Land of Fire” and the historic Zoroastrian fire cult. The towers contain a hotel, residential apartments, and office space, and dominate Baku’s night skyline.
3.2.2 Baku Boulevard (Seaside Park)
A long promenade along Baku Bay, established in the early 20th century. It stretches about 3.5 km from the Old City to the Flag Square area, featuring fountains, park benches, bicycle lanes, mini-golf, and an amusement park. Several notable structures line the boulevard, including the Baku Ferris Wheel (120 m, one of the largest in Eurasia) and the Carpet Museum, shaped like a rolled carpet.
3.2.3 Heydar Aliyev Center
Designed by Zaha Hadid, this cultural center opened in 2012. Its sweeping, fluid curves and white concrete exterior lack sharp angles, creating a sense of motion. The building houses a museum dedicated to Heydar Aliyev, a concert hall, and exhibition spaces. It has been widely praised as a masterpiece of contemporary architecture and a symbol of modern Baku.
4 Demographics and Culture
4.1 Population and Ethnic Composition
Baku’s population is estimated at over 2.3 million (2020 data), representing roughly one-quarter of Azerbaijan’s total population. The ethnic composition is predominantly Azerbaijani (over 90%). Significant minority groups include Russians, Lezgis, Talysh, and a small number of Ukrainians, Jews, and others. The city experienced an influx of internally displaced persons after the First Nagorno-Karabakh War (1988–1994), altering demographic patterns.
4.2 Language and Religion
The official language is Azerbaijani, a Turkic language written in the Latin script since 1991. Russian remains widely spoken as a second language, especially among older generations. English is growing in usage among the youth. The dominant religion is Shia Islam (about 85% of the population), with a Sunni minority. Baku is also home to small Christian (mainly Russian Orthodox) and Jewish communities. Religious tolerance is generally observed, with churches and synagogues coexisting alongside mosques.
4.3 Arts and Festivals
4.3.1 Baku International Jazz Festival
Founded in 2005, this annual festival celebrates jazz music and attracts international musicians. The event features concerts across various venues in the city, from the Baku Jazz Center to outdoor stages. Baku has a strong jazz tradition, dating back to the Soviet era when the city was considered a hotspot for Azerbaijani jazz musicians like Vagif Mustafazadeh.
4.3.2 Mugham and Traditional Music
Mugham is a classical Azerbaijani music genre combining poetry, complex melodic modes, and improvisation. The International Mugham Center in Baku, a modern venue shaped like an instrument, hosts regular performances and workshops. The city also holds the International Festival of Mugham, drawing performers from Central Asia, the Middle East, and beyond. Traditional folk instruments such as the tar, kamancheh, and balu (frame drum) are widely taught and performed.
5 Economy and Transport
5.1 Oil and Gas Industry
5.1.1 Offshore Platforms (Azeri–Chirag–Gunashli)
The ACG block, located about 120 km east of Baku in the Caspian Sea, is the largest oilfield complex in the region. Operated by a consortium led by BP, it consists of multiple production platforms (Chirag, Azeri, Deepwater Gunashli) and a floating production, storage, and offloading vessel (FPSO). The ACG fields have been producing crude oil since 1997, with peak annual output exceeding 50 million tonnes.
5.1.2 Baku‑Tbilisi‑Ceyhan Pipeline
Completed in 2006, the BTC pipeline transports crude oil from Baku through Georgia to the Turkish port of Ceyhan on the Mediterranean Sea. The pipeline is 1,768 km long and bypasses the Bosphorus Strait, providing a direct export route for Caspian oil to world markets. It has been crucial in reducing Azerbaijan’s dependence on Russian transit routes.
5.2 Other Sectors (Technology, Tourism)
In recent years, Baku has diversified its economy. The technology sector is growing, supported by the establishment of technology parks, business incubators, and the “Baku Tech Startup” initiative. Tourism has also expanded, with the number of visitors increasing after the 2015 European Games and the development of modern hotels, museums, and shopping centers. The Baku Expo Center hosts international exhibitions and trade fairs.
5.3 Public Transportation
5.3.1 Baku Metro
The Baku Metro opened in 1967 and currently consists of three lines (Red, Green, and Purple) covering 40.3 km and 27 stations. The system carries over 600,000 passengers daily. Stations are decorated in Soviet-style architecture, with murals, chandeliers, and marble finishes. Expansion plans include new lines to connect rapidly growing suburbs.
5.3.2 Bus and Railway Network
A fleet of buses, operated by BakuBus, covers the entire city with over 100 routes. Many buses are modern, low-floor vehicles. The Baku railway station serves domestic and international trains, including the Baku–Tbilisi–Kars railway, which provides a connection to Europe via Turkey. Suburban electric trains (Elektrichka) link Baku with towns on the Absheron Peninsula.
5.4 Heydar Aliyev International Airport
Located about 20 km northeast of the city center, this airport is the main international gateway to Azerbaijan. It has two passenger terminals (Terminal 1 for international flights, Terminal 2 for domestic) and a third terminal for VIP and cargo operations. The airport handles over 5 million passengers annually and serves as a hub for Azerbaijan Airlines (AZAL). Direct flights are available to major cities in Europe, Asia, the Middle East, and the Americas.
6 Education and Sports
6.1 Universities and Research Institutes
Baku is home to several prominent universities. Baku State University (founded 1919) is the oldest and largest, offering degrees in humanities, sciences, and medicine. The Azerbaijan State Oil and Industry University specializes in petroleum engineering. Other notable institutions include ADA University (founded 2014, focusing on international relations and business) and the Azerbaijan Medical University. The city also hosts research institutes such as the Institute of Physics and the Institute of Petrochemical Processes, both under the Azerbaijan National Academy of Sciences.
6.2 Sporting Venues and Events
6.2.1 Baku Olympic Stadium
Completed in 2015, this stadium has a capacity of 68,000 spectators. It served as the main venue for the 2015 European Games (the first edition of that event) and hosted the opening and closing ceremonies, athletics, and football matches. The stadium is also the home ground of the Azerbaijan national football team and hosts concerts and large-scale events.
6.2.2 Formula 1 Grand Prix
The Azerbaijan Grand Prix, a round of the FIA Formula One World Championship, has been held on the Baku City Circuit since 2016. The street circuit winds through the city, passing by the Old City, Baku Boulevard, and the government buildings. It is one of the fastest street circuits on the calendar, with speeds reaching over 360 km/h. The race often features dramatic crashes and overtakes, contributing to its reputation among drivers and fans. The event has boosted Baku’s international profile and tourism.