Four-thousand footers (sometimes abbreviated 4ks) are a group of forty-eight mountains in New Hampshire at least 4,000 feet (1,200 m) above sea level. To qualify for inclusion a peak must also meet the 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 4,000-foot mountains for peak-bagging: the 46 High Peaks in the Adirondacks.