The Caspian Sea, located in western Asia on the eastern edges of Europe, is the largest lake on the planet.

History records that it's called a sea because the Romans found it salty, especially in the southern reaches, and the name stuck.

The countries of Azerbaijan, Russia, Kazakhstan, Turkmenistan and Iran border the sea.

The Caspian coastline is one of the most popular destinations for Iran's domestic tourists. Sandy beaches give way to wide open steppes, thickly forested foothills and eventually the bare peaks of the Alborz mountain range. For many Iranians, especially those from Tehran, the lush vegetation and spectacular natural scenery, along with the tropical summers and mild winters, offer a striking contrast from city life and the dry interior.

As a result, the three provinces of Gilan, Mazandaran and Golestan which front the Caspian Sea (in fact, the world's largest lake) are studded with resort complexes, leisure facilities and holiday homes.

The Volga River (about 80% of the inflow) and the Ural River discharge into the Caspian Sea.

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.

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