The Columbia Glacier descends from an ice field 10,000 feet (3,050 meters) above sea level, down the flanks of the Chugach Mountains, and into a narrow inlet that leads into Prince William Sound in southeastern Alaska. It is one of the most rapidly changing glaciers in the world. Changes to the Columbia Glacier were tracked over more than 30 years using data from Landsat 4, 5, 7, and 8 data.