Caspian Sea is the largest enclosed body of water on Earth by area, with many classified as the world's largest lake or a sea full. Sea surface has an area of 371,000 km2 (143,200 sq mi) (excluding Aylagy Garabogazköl) and volume of 78,200 km3 (18,800 cu mi). It is in the basin endorheic (no flow) and bordered on the north by Russia, on the south by Iran, western Azerbaijan, and eastern Kazakhstan and Turkmenistan.
Fauna in the Caspian basin is very rich: large numbers of sturgeon (the main source of caviar), a variety of rare species of salmon can only be found in this area.
Caspian Sea is very rich in energy resources such as oil and gas deposits, which have been processed since the 10th century. Currently, the oil in the Caspian basin siperkirakan worth $ 12 trillion.
