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Hells Canyon caves reveal unexpected finding about America's deepest gorge

About 2,000 feet deeper than the Grand Canyon, Hells Canyon was rapidly carved when a lake spilled over about 2.1 million years ago, new research estimates.

Jun 20, 2025 - 16:46
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Hells Canyon caves reveal unexpected finding about America's deepest gorge
About 2,000 feet deeper than the Grand Canyon, Hells Canyon was rapidly carved when a lake spilled over about 2.1 million years ago, new research estimates.
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