Azerbaijan Republic: (more info)

Location: Southwestern Asia, bordering the Caspian Sea, Azerbaijan is bordering with Russia, Turkey, Iran, Armenia and Georgia
Area: total: 86,600 sq km
Caspian coastline: aprox. 800 km
Climate: dry, semiarid steppe
Population: 8,238,672 (July 2009 est.)
Languages: Azerbaijani 90.3%, Lezgi 2.2%, Russian 1.8%, Armenian 1.5%, other 3.3%, unspecified 1% (1999 census)
Capital: Baku
GDP: purchasing power parity - $73.65 billion (2008 est.)
GDP - per capita: purchasing power parity - $9,000 (2008 est.)
Inflation rate (consumer prices): 21.6% (2008 est.)
Labor force: 5.782 million (2008 est.)
Unemployment rate: 0.8% official rate (2008 est.)
Exports: $38.28 billion f.o.b. (2008 est.)
Imports: $7.496 billion f.o.b. (2008 est.)
Currency: 1 manat = 100 gopiks
http://www.azstat.org https://www.cia.gov/library/publications/the-world-factbook/geos/aj.html http://hdr.undp.org/en/countries/regions2008/

Islamic Republic of Iran: (more)

Location: Middle East, bordering the Gulf of Oman, the Persian Gulf, and the Caspian Sea, between Iraq and Pakistan
Area: total: 1.648 million sq km
Area - comparative: slightly larger than Alaska
Caspian coastline: aprox. 1000 km
note: Iran also borders the Caspian Sea (740 km)
Climate: mostly arid or semiarid, subtropical along Caspian coast
Population: 66,429,284 (July 2009 est.)
Languages: Persian and Persian dialects 58%, Turkic and Turkic dialects 26%, Kurdish 9%, Luri 2%, Balochi 1%, Arabic 1%, Turkish 1%, other 2%
Capital: Tehran
GDP: purchasing power parity - $842 billion (2008 est.)
GDP - per capita: purchasing power parity - $12,800 (2008 est.)

HDI value: 0.777 (2006)
Inflation rate (consumer prices): 28% (2008 est.)
Labor force: 24.35 million (2008 est.)
Unemployment rate: 12.5% (2008 est.)
Exports: $106.4 billion f.o.b. (2008 est.)
Imports: $67.79 billion f.o.b. (2008 est.)
Currency: 10 Iranian rials (IR) = 1 toman;
http://www.president.ir/
https://www.cia.gov/library/publications/the-world-factbook/geos/ir.html#Geo
http://www.gks.ru/
http://hdr.undp.org/en/countries/regions2008/

Kazakhstan Republic: (more info)

Location: Central Asia, northwest of China
Area: total: 2,717,300 sq km
Caspian coastline: aprox. 2320 km
Climate: continental, cold winters and hot summers, arid and semiarid
Population: 15,399,437 (July 2009 est.)
Capital: Astana
Languages: Kazakh (Qazaq, state language) 64%, Russian (official, used in everyday business) 95% (2001 est)
GDP: purchasing power parity - $176.9 billion (2008 est.)
GDP - per capita: purchasing power parity - $11,500 (2008 est.)
HDI value: 0.807 (2006)
Inflation rate (consumer prices): 18.6% (2008 est.)
Labor force: 8.358 million (2008 est.)
Labor force - by occupation: industry 18.4%, agriculture 31.5%, services: 50% (2005 est.)
Unemployment rate: 6.9% (2003 est.)
Exports: $66.57 billion f.o.b. (2008 est.)
Imports: $37.53 billion f.o.b. (2008 est.)
Currency: 1 Kazakhstani tenge = 100 tiyn
https://www.cia.gov/library/publications/the-world-factbook/geos/kz.html#Econ
http://www.president.kz/
http://hdr.undp.org/en/countries/regions2008/

Russian Federation: (more info)

Location: Northern Asia, bordering the Arctic Ocean, between Europe and the North Pacific Ocean
Area: total: 17,075,200 sq km
Caspian coastline: aprox. 1930 km
Climate: ranges from steppes in the south through humid continental in much of European Russia; subarctic in Siberia to tundra climate in the polar north; winters vary from cool along Black Sea coast to frigid in Siberia; summers vary from warm in the steppes to cool along Arctic coast
Population: 140,041,247 (July 2009 est.)
Languages: Russian, other
Capital: Moscow
GDP: purchasing power parity - $2.225 trillion (2008 est.)
GDP - per capita: purchasing power parity - $15,800 (2008 est.)
HDI value: 0.806 (2006)
Inflation rate: 13.9% (2008 est.)
Labor force: 75.7 million (2008 est.)
Unemployment rate: 6.2% (2008 est.)
Currency: 1 rouble (R) = 100 kopeks https://www.cia.gov/library/publications/the-world-factbook/geos/rs.html#Geo
http://president.kremlin.ru/
http://www.gks.ru/
http://hdr.undp.org/en/countries/regions2008/

Turkmenistan: (more info)

Location: Central Asia, bordering the Caspian Sea, between Iran and Kazakhstan
Area: total: 491,2 sq km (2003)
Caspian coastline: aprox. 650km
Climate: Deeply continental, dry
Population: 4,884,887 (July 2009 est.)
Languages: Turkmen 72%, Russian 12%, Uzbek 9%, other 7%
Capital: Ashgabat
GDP: purchasing power parity - $29.65 billion (2008 est.)
GDP - per capita: purchasing power parity - $6,100 (2008 est.)

HDI value: 0.728 (2006)
Inflation rate (consumer prices): 18% (2008 est.)
Labor force: 2.089 million (2004 est.)
Unemployment rate: 60% (2004 est.)  
Exports: $9.887 billion f.o.b. (2008 est.)
Imports: $5.291 billion f.o.b. (2008 est.)
Currency: 1 Turkmen manat (TMM) = 100 tenesi

The sources:
1."Statistical Yearbook of Turkmenistan for 2000-2003" ( Publishing House "Turkmen millihasabat")
2." The Gold Epoch of Turkmenistan in figures and facts" under reduction of V.M. Khramov and J. Bairamov, Ashkhabad , 2002
3. The operative - analytical review of the basic social and economic indicators  of Turkmenistan for January - April, 2005 National institute of the state statistics and  information of Turkmenistan . https://www.cia.gov/library/publications/the-world-factbook/geos/tx.html#People
http://www.grida.no/enrin/htmls/turkmen/soe2/index.htm
http://hdr.undp.org/en/countries/regions2008/