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Azerbaijan, officially the Republic of Azerbaijan, is a transcontinental country located at the boundary of Eastern Europe and West Asia. It is a part of the South Caucasus region and is bounded by the Caspian Sea to the east, Russia's republic of Dagestan 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.

Azerbaijan is a unitary semi-presidential republic. It is one of six independent Turkic states and an active member of the Organization of Turkic States and the TÜRKSOY community. Azerbaijan has diplomatic relations with 182 countries and holds membership in 38 international organizations, including the United Nations, the Council of Europe, the Non-Aligned Movement, the OSCE, and the NATO PfP program. It is one of the founding members of GUAM, the CIS, and the OPCW. Azerbaijan is also an observer state of the WTO.

The vast majority of the country's population (97%) is nominally Muslim, but the constitution does not declare an official religion and all major political forces in the country are secular. Azerbaijan is a developing country and ranks 91st on the Human Development Index. Geographically, Azerbaijan is located in the South Caucasus region of Eurasia, straddling Western Asia and Eastern Europe. It lies between latitudes 38° and 42° N, and longitudes 44° and 51° E. The total length of Azerbaijan's land borders is 2,648 km (1,645 mi), of which 1,007 km (626 mi) are with Armenia, 756 km (470 mi) with Iran, 480 kilometers with Georgia, 390 km (242 mi) with Russia and 15 km (9 mi) with Turkey. The coastline stretches for 800 km (497 mi), and the length of the widest area of the Azerbaijani section of the Caspian Sea is 456 km (283 mi). The country has a landlocked exclave, the Nakhchivan Autonomous Republic.Three physical features dominate Azerbaijan: the Caspian Sea, whose shoreline forms a natural boundary to the east; the Greater Caucasus mountain range to the north; and the extensive flatlands at the country's center. There are also three mountain ranges, the Greater and Lesser Caucasus, and the Talysh Mountains, together covering approximately 40% of the country. The highest peak of Azerbaijan is Mount Bazardüzü 4,466 m (14,652 ft), while the lowest point lies in the Caspian Sea −28 m (−92 ft) . Nearly half of all the mud volcanoes on Earth are concentrated in Azerbaijan, these volcanoes were also among nominees for the New 7 Wonders of Nature.

Azerbaijan is home to a wide variety of landscapes. Over half of Azerbaijan's landmass consists of mountain ridgescrestshighlands, and plateaus which rise up to hypsometric levels of 400–1000 meters (including the Middle and Lower lowlands), in some places (Talis, Jeyranchol-Ajinohur and Langabiz-Alat foreranges) up to 100–120 meters, and others from 0–50 meters and up (Qobustan, Absheron). The rest of Azerbaijan's terrain consists of plains and lowlands. Hypsometric marks within the Caucasus region vary from about −28 meters at the Caspian Sea shoreline up to 4,466 meters (Bazardüzü peak).

The formation of climate in Azerbaijan is influenced particularly by cold arctic air masses of Scandinavian anticyclone, temperate air masses of Siberian anticyclone, and Central Asian anticyclone. Azerbaijan's diverse landscape affects the ways air masses enter the country. The Greater Caucasus protects the country from direct influences of cold air masses coming from the north. That leads to the formation of subtropical climate on most foothills and plains of the country. Meanwhile, plains and foothills are characterized by high solar radiation rates.

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