The term Four-Thousand Footers (or "4ks") refers to a group of forty-eight mountains in New Hampshire at least 4,000 feet (1,219 meters) above sea level. To qualify a peak must also meet a more technical criterion of topographic prominence important in the mountaineering sport of "peak-bagging". The AMC also maintains a list of New England 4000-Footers, all falling within Vermont, New Hampshire, and Maine. Other lists of 4000-footers not maintained by the AMC include the original set of four-thousand foot mountains for peak-bagging: the 46 High Peaks in the Adirondacks.