The Caspian Sea is located where Southeastern Europe connects to Asia. It is bordered by five countries, on the north by Russia, on the east by Turkmenistan and Kazakhstan, on the west by Azerbaijan and on the south by Iran.
In terms of surface area, the Caspian Sea is the largest landlocked body of water on the planet, measuring around 230,529 square miles. Its name is a misnomer because the Caspian Sea is actually a lake. Due to its salinity, the ancient Romans named it the Caspian Sea after the local tribe that inhabited the area. Another account for its name's origin is attributed to the Caspian Sea's vast expanse, which led to the perception of the ancient Greeks and Persians that the lake was a "sea." Scientists consider the Caspian Sea to be one of the most significant aquatic ecosystems in Central Asia.