Closed lakes usually become saline, or salty. If water only leaves a lake by evaporation, the lake is closed. If water leaves a lake by a river or other outlet, it is said to be open. The water in lakes comes from rain, snow, melting ice, streams, and groundwater seepage. It is more than 395 meters (1,300 feet) below sea level.

The lowest lake is the Dead Sea, between Israel and Jordan. It is about 3,810 meters (12,500 feet) above sea level. One of the highest is Lake Titicaca, in the Andes Mountains between Bolivia and Peru. Lakes exist at many different elevations.

Other lakes are so shallow that a person could easily wade across them. Although Lake Baikal covers less than half the surface area of Lake Superior-one of North America’s Great Lakes-it is about four times deeper and holds nearly as much water as all five of the Great Lakes combined. Its bottom is nearly 2 kilometers (more than 1 mile) below the surface in places. The world’s deepest lake is Lake Baikal, in Russia. The Caspian Sea, in Europe and Asia, is the world’s largest lake, with an area of m ore than 370,000 square kilometers (143,000 square miles). Other lakes are so big that they are called seas. Such small lakes are often referred to as ponds. Some measure only a few square meters and are small enough to fit in your backyard. They are found on every continent and in every kind of environment-in mountains and deserts, on plains, and near seashores. There are millions of lakes in the world.

A lake is a body of water that is surrounded by land.

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