A block of ice that has broken or calved from the face of a glacier and is floating in a body of marine of fresh water. Alaskan icebergs rarely exceed 500 feet in maximum dimension. In order of increasing size, the following names are used: Brash Ice, Growler, Bergy Bit. North-looking photograph showing an iceberg shaped like a mushroom, towering ~ 15 feet above the waters of Muir Inlet, Glacier Bay National Park, Alaska. North-looking photograph showing 300+-foot-long iceberg towering more than 40 feet above the waters of Portage Lake, Chugach National Forest, Chugach Mountains, Alaska. Near vertical aerial photograph of the southwest coast of Greenland (upper right) flanked by a large, dense field of drifting icebergs. Most icebergs are less than 400 feet in maximum length, but the large berg in the upper left is at least 1/4-mile in length.