Hubbard Glacier vs. Endicott Arm & Dawes Glacier. Hubbard Glacier vs. Glacier Bay. Hubbard Glacier, Alaska. Hubbard Glacier is the longest tidewater glacier in North America. Roughly 76 miles long and as tall as a 30-story building, Hubbard Glacier is as large as the state of Rhode Island and is the biggest glacier you can see from a cruise ship.
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