The largest lake in the world by a long shot is the Caspian Sea – a name that hints at a past when it was contiguous with the ocean around 11 million years ago.
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Lake Michigan is the third largest of the Great Lakes and ranks as the fifth largest lake in the world (by surface area). Source: Lake Michigan Basin statistics map produced by Michigan Sea Grant/Michigan State University Extension (2000).
By definition, a lake is a single body of water surrounded by land, so the quintet really should be called “the Great Lake.” That vast Eurasian pool called the Caspian Sea is bigger (143,244 square miles), but it's not fresh water.
The largest lake in the world is the Caspian Sea. Although it is often considered a sea because of its size and salinity, it is technically classified as an endorheic lake. With a surface area of around 371,000 km², the Caspian Sea far exceeds any other lake in terms of size.
The lake's formation began 1.2 billion years ago when two tectonic plates moving in opposite directions left a giant scar—an event now known as the Midcontinent Rift. Less than 15,000 years ago, melting glaciers filled the giant basin, and Lake Michigan came to be. The lake's maximum depth is 925 feet.
Hydrology. The Caspian has characteristics common to both seas and lakes. It is often listed as the world's largest lake, although it is not freshwater: the 1.2% salinity classes it with brackish water bodies. It contains about 3.5 times as much water, by volume, as all five of North America's Great Lakes combined.
3. Can you swim in the Caspian Sea? Most parts of the sea are perfect for swimming and relaxing. It has a fantastic climate, and not to forget that the sands in the Absheron peninsula, near Baku and other villages, are rich in minerals and salts with healing properties.
For some who study the Great Lakes, relative size is a defining factor, particularly with Lake Superior, which is the world's largest lake by surface area (aside from the much larger Caspian Sea—if you're willing to call it a lake).
The Caspian Sea is larger than the Lake Superior by surface area. The surface area of the Caspian Sea measures approximately 371, 000 square kilometers while the surface area of Lake Superior measures approximately 82,000 square kilometers.
Lake Superior is the Cleanest and Clearest Great LakeBecause of its somewhat isolated location and long cold winters, not much farming is done along Superior's shores. This means lower amounts of nutrients, sediments, and organic material are floating around the lake.
At 1,943 feet (592 meters), Crater Lake is the deepest lake in the United States and one of the deepest in the world. The depths were first explored thoroughly in 1886 by a party from the U.S. Geological Survey.
Dreyer is the only person who has swum the width of Lake Michigan between Wisconsin and Michigan, having swum from Two Rivers, Wisconsin, to Ludington, Michigan, in 1998. In the 2023 swim, he was attempting to beat his own record by swimming 25 miles further in the route from Milwaukee to Grand Haven.
At the bottom of Lake Michigan, you will find non-fish inhabitants of the lake, such as worms, mollusks, amphipods, and insect larvae. These small creatures provide food for non-native fish such as whitefish, round goby, and perch.
Situated in south-east Siberia, the 3.15-million-ha Lake Baikal is the oldest (25 million years) and deepest (1,700 m) lake in the world. It contains 20% of the world's total unfrozen freshwater reserve.