Which national park in Alaska is known for its tidewater glaciers?

The national park in Alaska known for its tidewater glaciers is Glacier Bay National Park.

More precisely, the official unit is Glacier Bay National Park and Preserve, a vast protected landscape in southeastern Alaska. Its ice-carved fjords reach into Glacier Bay, where glaciers descend from the Fairweather Range and terminate in seawater. Tidewater glaciers can calve icebergs directly into the ocean or a marine bay, producing the dramatic sights and thunderous sounds associated with the park.

The park has seven recognized tidewater glaciers, including Margerie, Grand Pacific, Johns Hopkins, Lamplugh, McBride, Gilman, and LaPerouse. Four of these actively calve ice into the bay. The present landscape also records rapid historical change: when naturalist John Muir visited in 1879, the bay’s main glacier had retreated roughly 48 miles from the position reported during the late-eighteenth-century Vancouver expedition.

Denali is famous for North America’s highest peak, while Kenai Fjords is also strongly associated with glaciers. Glacier Bay is the best canonical answer here because tidewater glaciers define its signature coastal environment.