Narrow inlet of the Pacific Ocean, southeastern Alaska coast, U.S. About 60 mi (97 km) long, it contains 16 active glaciers that descend from the St. Elias Mountains to the east and Fairweather Range to the west.
The bay has fjordlike inlets and many largely treeless islands, used as rookeries by thousands of seabirds. It is the focus of Glacier Bay National Park and Preserve .