The Caspian Sea is a lake, not a sea. It is called a sea because the Romans who discovered it found it to be salty. The countries of Iran, Turkmenistan, Kazakhstan and Russia border the lake.
The Caspian Sea is a place of great oil and gas production. It is also home to a large population of sturgeon, and the caviar from sturgeon eggs is highly sought after in culinary circles.
Although fresh water flows into the Caspian Sea, it is still salty in some areas.Learn more about Bodies of Water