Hells Canyon, the deepest gorge in the U.S., is surprisingly young

May 27, 2025
Hells Canyon, the deepest river gorge in the United States, was carved just about 2.1 million years ago — making it much younger than the Grand Canyon.

Hells Canyon is the deepest river canyon in the United States. Now scientists have solved the mystery of when it formed.

(Image credit: Matthew Morriss)



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