Azerbaijan is situated on the southeastern part of the Caucasus, which stretches for more than 800 km from the Black to the Caspian sea. Lying at the crossroads of Europe and Asia, the country has a unique geographical position, and retains its significance for world economic and cultural links.
Azerbaijan is surrounded by mountains, occupying more than half of its territory: to the north is the Greater Caucasus with the highest peak of the country Bazardyuzy - 4,466m ( its southeastern part reaches Azerbaijan), to the southwest is the massive Transcaucasian upland extending to Armenia and Georgia, bordered by the Lesser Caucasus, and to the south the Talysh Mountains. In the west, beyond the boundary of Azerbaijan, the Greater Caucasus and Lesser Caucasus are bound by the Likh (Suram) range to the east beyond the vast Kur-Araz lowland. It is edged with sloping valleys and lowlands. Thus, the surface of Azerbaijan resembles a gigantic tray with sharp mountainous edges, sloping to the Caspian Sea.
The main contrasts in the nature of Azerbaijan come from the difference between humid mountains and dry plains. The landscape varies from dry, hot semi-deserts, to snow-capped highlands and glaciers. The unique diversity of Azerbaijan's nature is a result of its geographical position and diverse relief. The present-day panoramic view of Azerbaijan, with its high mountains, volcanic highlands, deep canyons, plains, valleys and coastlines has been forming over millions of years.
The northern border of Azerbaijan with the Russian Federation (Dagestan) stretches along the ridges of the divide ranges of the Greater Caucasus. In the northwest of the country, the divide ranges sharply descend into the Qanix (Alazan)-Agrichay valley. To the east of Bazardyuzy - the highest peak of the Eastern Caucasus - both slopes of the divide ranges belong to Azerbaijan.
Some of the rivers of Azerbaijan pour into the Kur river, others flow at first into the Araz, the Kur's largest tributary, and still others run straight to the Caspian Sea. The annual flow of these rivers is estimated at 7.78 billion cubic meters. The distribution of the river net over the territory is uneven. On lowlands, with soft soil permeable to water, they are rare but in the mountains the number of rivers increases due to abundant rainfalls and the relief. The river net is well developed on 1,000-2,500 m heights. Generally, there is 90,000 cu meters of drain per 1 sq.km.
The biggest river in Azerbaijan is the Kur. It is 1,515 km long (900 km within Azerbaijan). The Araz flows into the Kur 236 km from its mouth. The Kur forms a delta at its mouth which is 15 km long. It drains into the Caspian Sea through two branches: northeast, now shoaled, and southeast. A navigable route was dug in 1964 in the southeastern direction. The Kur is the only river in Azerbaijan important for transportation. The part of the Kur from Yevlakh to its mouth is navigable for small passenger and cargo vessels. The second river in size is the Araz, 1,072 km long. Like the Kur, the headwater of the Araz is in Turkey. Araz makes a natural boundary between Azerbaijan, Turkey and Iran along a length of 580 km. On the territory of Nakhchivan the river has several tributaries: the East Arpachay, the Nakhchivan, the Alindjachay and the Gilanchay. After the Acer ( Hakeri) river flows into, Araz reaches the Kur-Araz lowland.
The number of small lakes in Azerbaijan is about 250. The lakes in mountains are of tectonic and glacial origin, such as Goy-gol (at 1,556 m) and Big and Small Alagel (at 2,730 m). Along the Caspian coast there are the lakes - Devechi, Gemushovan, Gil, Kildag. Binagadi bitumen lake on the Apsheron is unique as place of mass burial of extinct ancient animals.