Longest tidewater glacier (Alaska)
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The Hubbard Glacier is the longest tidewater glacier in Alaska. Its longest source originates 122 km (76 miles) from its snout and its calving face is over 10 km in length. As the glacier slowly slides toward the ocean, large pieces calve (break off) to form icebergs. Most tidewater glaciers calve above the surface resulting in a thunderous crash of ice into the ocean. Some tidewater glaciers calve underwater thus causing the iceberg to surge up to the surface from below. Water displaced during calving often produces huge waves. Diving anywhere near a calving glacier would be extremely dangerous and should never be attempted.
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