Hubbard Glacier, Tidewater glacier in Yukon, Canada.

The Hubbard Glacier is a tidewater glacier in the Saint Elias Mountains that extends 122 kilometers (76 miles) from high peaks to the shore of Disenchantment Bay. The ice wall at the terminus rises roughly 120 meters (390 feet) above sea level and reaches another 90 meters (300 feet) below the water surface.

The glacier received its name in 1890 to honor Gardiner Greene Hubbard, an American businessman and founder of the National Geographic Society. In 1986, it temporarily blocked Russell Fjord and created a freshwater lake until the ice gave way under water pressure.

The Tlingit call this ice mass Sít' Tlein and have watched its movements across many generations. During summer months, boats approach the ice face and visitors hear the loud crack of calving ice echo across the water.

Ships must keep their distance from the ice face in Disenchantment Bay, since newly calved icebergs can shoot up from below the waterline. The cruise ship Norwegian Sun struck a growler in fog on 25 June 2022 and had to cut its itinerary short for repairs. Fog and drifting ice make visibility and safe navigation the main constraints on any approach.

The ice calving from the face today took roughly 400 years to travel from the accumulation zone to the terminus. Some icebergs that break free are the size of multistory buildings and drift in the bay before melting.