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First Crewed Descent to Challenger Deep

#00500 / Nature

World's Oldest Lake

Evidence-backed

about25 millionyears

Lake Baikal

Lake Baikal

Lake Baikal in southeastern Siberia, Russia, formed in a continental rift system approximately 25 million years ago. UNESCO and the US Geological Survey identify it as the world's oldest existing lake.

JiLuDB /

Largest Confirmed Terrestrial Impact Structure

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