The Great Gulf is a glacial cirque, or amphitheater-like valley head formed from a glacier by erosion, located in the White Mountains of New Hampshire. The cirque's walls are formed, from south to north, by the mountainsides of Mount Washington (6,288 ft/1917 m), Mount Clay (5,533 ft/1686 m), Mount Jefferson (5,716 ft/1742 m), Mount Adams (5,799 ft/1768 m), and Mount Madison (5,366 ft/1636 m).