Caspian Sea

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Image:Caspian Sea from orbit.jpg
Caspian redirects here. Caspian X is the fictional king of C. S. Lewis' Chronicles of Narnia.

The Caspian Sea or Mazandaran Sea is a landlocked sea between Asia and Europe (European Russia). It is the world's largest inland body of water. It has a surface area of 371,000 km² (143,000 sq. mi.), and a maximum depth of about 980m (3200 ft). Thus it has characteristics common to both seas and lakes. It is often listed as the world's largest lake, though it is not a freshwater one.


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Geography

The Caspian Sea is bordered by Russia (Dagestan, Kalmykia, Astrakhan Oblast), Republic of Azerbaijan, Iran/Persia (Guilan, Mazandaran and Golestan provinces), Turkmenistan, and Kazakhstan, with the central Asian steppes to the north and east. On its eastern Turkmen shore is a large embayment, the Kara Bogaz Gol.

The sea is connected to the Sea of Azov by the Manych Canal.

Cities near the Caspian Sea

Major cities by the Caspian Sea:

Image:Baku 2.jpg

History

The sea is estimated to be about 30 million years old. It became landlocked about 5.5 million years ago. Discoveries in the Huto cave near the town of Behshahr, Iran suggest human habitation of the area as early as 75,000 years ago.

In classical antiquity it was called the Hyrcanian Ocean. It has also been known as the Khazar Sea. In Persian antiquity, as well as in modern Iran, it is known as the Mazandaran Sea. Old Russian sources call it the Khvalyn (Khvalynian) Sea after the Khvalis, inhabitants of Khwarezmia. Ancient Arabic sources refer to Bahr-e-Qazvin – the Qazvin Sea.


See also "Names of the Caspian Sea".

Historical cities by the sea include

Fauna

The Caspian holds great numbers of sturgeon, which yield eggs that are processed into caviar. However, overfishing has threatened the sturgeon population to the point that environmentalists advocate banning sturgeon fishing completely until the population recovers.

The Caspian Seal (Phoca caspica, Pusa caspica in some sources) is endemic to the Caspian Sea, one of very few seal species living in inland waters (see also Baikal Seal).

Oil

The area is rich in energy wealth. As well as recently discovered oil fields, large natural gas supplies are also in evidence, though further exploration is needed to define their full potential. Geopolitical jockeying is taking place amongst Caspian-bordering countries, especially in the light of Middle East instability and the subsequent recasting of many Western countries' energy policies. Another factor influencing this is the new US military deployment to the Central Asian region.

A key problem is the status of the Caspian Sea and the establishment of the water boundaries between the five littoral countries. Russia, Azerbaijan and Kazahkstan signed an agreement in 2003 to divide the northern 64% of the sea between themselves, although the other two bordering countries, Iran and Turkmenistan, did not agree to this. This is likely to result in the three agreeing nations proceeding with oil development regardless; Iranian and Turkmen development is likely to stall.

At present, Azerbaijan and Kazahkstan have seen the biggest increase in oil production - an increase of 70% since 1992. Despite this, the region is still achieving less than potential output, with total regional production 1.6 million barrels (250,000 m³) per day - roughly equal to Brazil's production. This is expected to triple by 2010.

Characteristics and ecology

The Caspian has characteristics common to both seas and lakes. It is often listed as the world's largest lake, though it is not a freshwater lake.

The Volga River (about 80% of the inflow) and the Ural River discharge into the Caspian Sea, but it is endorheic, i.e. there is no natural outflow (other than by evaporation). Thus the Caspian ecosystem is a closed basin, with its own sea level history that is independent of the eustatic level of the world's oceans. The Caspian became landlocked about 5.5 million years ago. The level of the Caspian has fallen and risen, often rapidly, many times over the centuries. Some Russian historians claim that a medieval rising of the Caspian caused the coastal towns of Khazaria, such as Atil, to flood. In 2004, the water level is -28 metres, or 28 metres/92 feet below sea level.

Over the centuries, Caspian Sea levels have changed in synchronicity with the estimated discharge of the Volga, which in turn depends on rainfall levels in its vast catchment basin. Precipitation is related to variations in the amount of North Atlantic depressions that reach the interior, and they in turn are affected by cycles of the North Atlantic Oscillation. Thus levels in the Caspian sea relate to atmospheric conditions in the North Atlantic thousands of miles to the north and west. These factors make the Caspian Sea a valuable place to study the causes and effects of global climate change.

The last short-term sea-level cycle started with a sea-level fall of 3 m from 1929 to 1977, followed by a rise of 3 m from 1977 until 1995. Since then smaller oscillations have taken place[1]. These changes have caused major environmental problems[2].

Transportation

Several scheduled ferry services operate on the Caspian Sea, including:

See also

External links

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