Geography

The total length of Azerbaijani land borders is 2,648 km, of which Armenia constitutes 1007, Iran 756, Georgia 480, Russia - 390 and Turkey - 15. The coastline stretches for 800 km and the length of the widest area of the Azerbaijani section of Caspian Sea is 456 km. The territory of Azerbaijan extends 400 km from north to south, and 500 km from west to east. The three mountain ranges are 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), while the lowest point lies in the Caspian Sea (-28 m). Nearly half of all the mud volcanoes on Earth are concentrated in Azerbaijan.


The main water sources are the surface waters. However, only 24 of the 8,350 rivers are greater than 100 km in length. All the rivers drain into the Caspian Sea in the east of the country. The largest lake is Sarısu (67 km²) and the longest river is Kur (1,515 km), which is transboundary. Azerbaijan's four main islands in the Caspian Sea have a combined area of over thirty square kilometers.

Climate

The formation of climate in Azerbaijan is influenced particularly by cold arctic air masses of Scandinavian anticyclone, temperate of Siberian anticyclone, and Central Asian anticyclone. Regarding landscape diversity, air masses have different ways to 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.
Nine out of eleven existing climate zones are present in Azerbaijan. Both the absolute minimum temperature (-33 °C (-27.4 °F)) and the absolute maximum temperature (+46 °C (114.8 °F)) were observed in Julfa and Ordubad. The maximum annual precipitation falls in Lankaran (1,600 to 1,800 mm) and the minimum in Absheron (200 to 350 mm).

Nature and ecology
From the water supply point, Azerbaijan is below the average in the world with approximately 100,000 m³/year of water per km². All big water reservoirs are built on Kur.
The main areas of plant diversity in Azerbaijan are the highlands of Nakhchivan (60% of the species occur here), the Kura-Araz plain (40%), the Davachi-Quba region east of the Greater Caucasus (38%), the centre of the Lesser Caucasus (29%), Gobustan (26.6%), the Lenkoran region in the Talysh Mountains (27%) and the Absheron region (22%). Northern-eastern slopes of the Great Caucasus, the northern, northern-eastern, and eastern slopes of the Lesser Caucasus and Talysh Mountains are deemed to be vast forest areas of Azerbaijan.
Endemics include over 400 species of plants (of which around 16 species of Caspian algae), seven reptiles and perches from fifteen species and six sub-species of Gobiidae. Most of the endemic freshwater fish belongs to Cypriniformes. However there are no strictly endemic mammals. The major cause of biodiversity loss in Azerbaijan is the decrease in natural environments.