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What's the oldest lake on Earth?

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Lake Baikal in southeast Siberia is estimated to be the world's oldest lake.

Scientists estimate it is 25 million years old , but the Great Lakes formed less than 20,000 years ago .

The second oldest lake on Earth is Lake Issyk-Kul in Kyrgyzstan , which formed about 20 million years ago , scientists say.

The lake is also the deepest one, at about 1 mile deep.

Elana Spivack is a science writer based in New York City .

She has a master's degree from New York University's Science Health and Environmental Reporting Program and a bachelor's from Kenyon College in Ohio .

She's written for Inverse, Popular Science , BitchMedia and others.