Azerbaijan covers 86,600 square kilometres on the western shore of the Caspian Sea, at the eastern end of the South Caucasus where Europe and Western Asia meet. Its main territory borders Russia to the north, Georgia to the northwest, Armenia to the west and Iran to the south; the Nakhchivan Autonomous Republic, separated from the rest of the country by Armenia, also borders Iran and Türkiye. Baku, the capital and dominant city, occupies the Absheron Peninsula on the Caspian coast. The country’s physical structure is unusually compressed: the Greater Caucasus rises along the northern frontier, reaching 4,466 metres at Bazardüzü; the Lesser Caucasus and Karabakh uplands occupy the west and southwest; the Talysh Mountains rise in the southeast; and the broad Kura-Aras Lowland forms the central interior. Parts of that lowland and the Caspian shore lie below global mean sea level. This mountain-and-basin arrangement channels settlement, farming and transport into relatively narrow lowland corridors.
Climate changes sharply over those short distances. The Kura-Aras Lowland, much of Nakhchivan and the Absheron Peninsula are dry to semi-arid, with hot summers, limited rainfall and strong dependence on stored or diverted water. Baku’s Caspian setting moderates temperature extremes but does not remove aridity, while exposed coastal districts are notably windy. Elevation brings cooler conditions and greater precipitation to the Greater and Lesser Caucasus, with persistent winter snow at higher levels; by contrast, the Lankaran Lowland and lower Talysh slopes in the southeast have a much wetter, humid subtropical regime. Mountain barriers intercept moist air and create rain shadows inland, making the Kura and Aras river systems central to irrigation and water security. Drought and heat therefore affect agriculture disproportionately, while intense rainfall can trigger floods, mudflows and landslides in mountain catchments. Salinization and erosion trouble irrigated lowlands, and the continuing fall in Caspian Sea level is adding ecological and navigation pressures along the coast.
Those climatic contrasts support ecosystems ranging from semi-desert and dry steppe to montane forest, alpine grassland, wetlands and relict temperate woodland. Forests are concentrated mainly on mountain slopes rather than the central plains; the Talysh-Lankaran zone contains part of the ancient Hyrcanian forest system shared with Iran, whose Azerbaijani components joined UNESCO’s transboundary World Heritage property in 2023. The Greater Caucasus supports broadleaf forests and high-elevation meadows, while Caspian lagoons and marshes provide habitat for migratory birds. Agriculture reflects the same geography. Cereals, cotton, vegetables, fruit and grapes are produced in irrigated lowlands and foothills, tea and citrus particularly in the humid southeast, and livestock remains important in upland and drier districts. The Kura, Aras, reservoirs and irrigation works make cultivation possible across otherwise water-limited terrain. That dependence also exposes rural livelihoods to drought, inefficient irrigation, soil salinity, overgrazing and erosion, tying environmental management directly to food production and regional development.
Human occupation is far older than the modern state: UNESCO’s Gobustan Rock Art Cultural Landscape preserves more than 6,000 engravings spanning roughly 40,000 years, alongside caves, settlements and burials. In antiquity, much of today’s republic lay within or alongside Caucasian Albania, a polity distinct from the modern Balkan country of Albania and influenced at different times by Iranian, Roman and other Caucasian powers. Arab conquest from the seventh century accelerated the spread of Islam, while subsequent centuries brought rule or influence from regional Muslim dynasties. Oghuz Turkic migrations from the eleventh century helped shift the linguistic landscape toward the Turkic language that developed into modern Azerbaijani. The Shirvanshahs maintained a durable state centred on Shirvan and, later, Baku, even as Seljuk, Mongol, Ilkhanid and Timurid power reshaped the wider Caucasus. From the sixteenth century the eastern South Caucasus was repeatedly contested between Safavid Iran and the Ottoman Empire; Safavid state patronage also helped entrench Twelver Shiism. After Nader Shah’s death in 1747, locally ruled khanates including Baku, Ganja, Karabakh, Quba, Shaki, Shirvan and Nakhchivan emerged under varying degrees of Iranian suzerainty.
Russian imperial expansion transformed that political geography in the nineteenth century. After two Russo-Persian wars, the treaties of Gulistan in 1813 and Turkmenchay in 1828 transferred khanates north of the Aras into the Russian Empire, fixing a durable frontier with Iran and dividing Azerbaijani-speaking communities across it. Baku’s late nineteenth-century oil boom turned the Caspian city into a major industrial centre and drew capital and workers from across the empire. Following the Russian collapse, the Azerbaijan Democratic Republic was proclaimed in 1918 but survived less than two years before the Red Army entered Baku in April 1920. Soviet rule brought collectivization, industrialization and rapid urbanization; Nagorno-Karabakh became an autonomous oblast within the Azerbaijan SSR in 1923, while Nakhchivan retained autonomous republican status. Independence was restored in 1991 amid war with Armenia. The 1994 ceasefire left Armenian forces controlling Nagorno-Karabakh and surrounding Azerbaijani districts; Azerbaijan recovered most lost territory in the 2020 war and ended the separatist administration after its September 2023 offensive, followed by the departure of almost the entire ethnic Armenian population. A peace treaty was initialled with Armenia in August 2025, but as of July 2026 it had not been formally signed.
Hydrocarbons remain the structural centre of the economy even as non-oil activity has expanded. Azerbaijan produced GDP of 129.1 billion manats in 2025, when real output rose 1.4%; oil-and-gas value added contracted by 1.6% while the non-oil-and-gas economy grew 2.7%. The pattern continued in January–July 2026, with overall GDP up 1.4% year on year, the hydrocarbon sector down 0.6% and the non-oil sector up 2.2%. Caspian crude reaches the Mediterranean through the Baku–Tbilisi–Ceyhan pipeline, while Shah Deniz gas moves west through the Southern Gas Corridor toward Türkiye and European markets. In 2025 merchandise trade totalled about US$48.9 billion, with exports of US$24.5 billion and imports of US$24.4 billion; hydrocarbons still dominate export earnings. Italy remains a leading export market. The sovereign oil fund cushions petroleum-revenue volatility, but mature oil production, commodity-price exposure and regional disparities make diversification into manufacturing, agriculture, logistics, digital services and renewable energy a central development objective.
The latest national census was conducted in October 2019, and official population estimates remain anchored to it with subsequent births, deaths and migration added. The State Statistical Committee put the population at 10.2624 million on 1 January 2026, up modestly from roughly 9.98 million in its 2019 population series. Settlement is highly uneven: Baku and the surrounding Absheron Peninsula form the principal demographic and economic concentration, while high mountain districts are thinly populated. Official mid-2025 figures classified about 54% of residents as urban. Sumgait, northwest of Baku, is a major industrial city; Ganja is the principal urban centre of the west; Mingachevir developed around the Kura and its reservoir; Lankaran anchors the humid southeast; and Nakhchivan city serves the autonomous exclave. Azerbaijan is a unitary presidential republic organized through districts and cities, with Nakhchivan constitutionally autonomous. Ethnic Azerbaijanis form the large majority, alongside Lezgin, Talysh, Avar, Russian and other communities shaped by borderland settlement and Soviet-era mobility.
Azerbaijani, a Turkic language, is the state language and uses a Latin-based alphabet, while Russian remains widely understood in parts of Baku and other urban, professional and educational settings. Minority languages include Lezgian, Talysh and Avar, among others, and the constitution protects their free use and development. Islam is the majority religion, with both Shia and Sunni traditions, but Azerbaijan is constitutionally secular and Soviet rule left a strong legacy of institutional separation between religion and public administration. Smaller Orthodox Christian, Jewish, Catholic and Protestant communities add to the religious landscape. Culture reflects centuries of interaction among Turkic, Iranian, Caucasian, Russian and Soviet spheres rather than a single uniform tradition. UNESCO-recognized practices such as Azerbaijani mugham, ashig performance and carpet weaving remain important cultural reference points. Baku’s Walled City and Shirvanshah Palace, together with oil-boom architecture and Soviet urban fabric, preserve successive political and economic layers in the built environment.
Transport infrastructure reflects Azerbaijan’s dual role as energy exporter and Caspian land bridge. Roads carry most domestic passengers and much freight, while railways link Baku with Georgia and Türkiye to the west, Russia to the north and routes toward Iran in the south. Official end-2025 statistics recorded 2,118 kilometres of railway lines and 6,132 kilometres of trunk pipelines; Baku Metro had 40.7 kilometres of double-track route. The Port of Baku at Alat is the principal Caspian freight hub for rail-road-sea transfers on the Trans-Caspian or Middle Corridor. Heydar Aliyev International Airport handled more than 7.6 million passengers in 2025, supported by regional airports including Ganja and Nakhchivan. Electricity access was effectively universal by 2024. Generation remains dominated by gas-fired thermal plants, although utility-scale solar and wind capacity is growing. Infrastructure is densest around Baku and major corridors; mountain, border and reconstructed districts face higher costs of access and network extension.
Azerbaijan’s international weight comes less from its size than from the intersection of Caspian energy, Caucasus transport geography and borders with Russia and Iran, combined with direct access to Türkiye through Nakhchivan. It belongs to the United Nations, OSCE, Council of Europe and Organization of Turkic States, while maintaining especially close ties with Türkiye and substantial energy relationships with Europe. The Middle Corridor can connect Central Asia across the Caspian to the South Caucasus and Türkiye, while the North–South route links Russian and Iranian markets; normalization with Armenia could add a direct connection between Azerbaijan proper and Nakhchivan. That opportunity remains conditioned by the still-unfinalized peace treaty and reconstruction in formerly contested districts. Longer-term constraints include hydrocarbon dependence, declining Caspian levels, water stress and uneven regional development. The country’s medium-term importance will depend on whether transit, energy diversification and post-conflict connectivity can reduce rather than reproduce the vulnerabilities created by its resource-rich and geopolitically exposed geography.
