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

6. Glacier Bay

As recently as 1750, Glacier Bay was an enormous single glacier thousands of feet tall, a mile wide, and dozens of miles long.

But over the last couple of centuries, lower average snowfall and higher average temperatures have whittled away the glacier. It’s down to a fraction of its original girth, about 21 miles long and 350 feet thick.

Margerie Glacier at Glacier Bay National Park.

Eric E Castro
Eric E Castro

Because there are no roads at the park, access to Glacier Bay is restricted to boat or aircraft.

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However, tour boats can usually drop anchor near the glacier for close-up shots of the ice face and ice calving (when a big chunk of ice breaks off and splashes into the water).