What is the oldest known natural lake in the USA?

Clear Lake is one of California's oldest lakes and the largest natural lake (177 km2) existing entirely within California. It is also believed to be the oldest natural lake in North America, with continuous lake sediments dating to the early Pleistocene, yielding age estimates of 1.8–3.0 million years old.



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Lake Ohrid is considered the deepest and oldest lake in Europe. It was reported that the Lake has the most biodiverse freshwater bodies of water in the world with many endemic species.

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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.

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During the 1960s, Lake Erie was declared a “dead lake” due to eutrophication and pollution.

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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. Their primitive sounding device consisted of a lead pipe attached to piano wire.

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Lake Annecy, France Located in the Haute-Savoie department, which borders Italy and Switzerland, Lake Annecy is a pristine body of water that's often called the cleanest lake in Europe, thanks to strict environmental regulations set in place in the 1960s.

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Annecy. Regarded as the clearest lake in Europe, Annecy is home to a picturesque town of the same name – sometimes also known as Venice of the Alps due to its numerous water canals.

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Blue Lake, New Zealand Blue Lake has underwater visibility up to 70 to 80 meters or 230 to 260 feet down, which is insane! Apart from being the world's clearest lake, it's also the clearest body of natural freshwater. The water in Blue Lake is comparable to distilled water based on laboratory measurements.

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Stretching all the way down to 1,645 feet deep, Lake Tahoe has beautiful crystal-clear waters at an elevation of 6,225 feet above sea level. Known for its phenomenal clarity, this ancient lake has the purest waters in North America, making this The Clearest Lake in the United States.

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