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Little-Known Trivia About The 10 Largest U.S. National Parks

9. Kobuk Valley

Sand dunes over ten stories high in Alaska? Yep, you’ll find them at the Kobuk Valley National Park.

National Park Service
National Park Service

The grinding action of ancient glaciers created the sand that has been transported by wind and water to form the Kobuk Valley sand dunes.

Standing over 150 feet high, the sand dunes hold permafrost ice wedges and fossils of Ice Age mammals.

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