This list differs substantially from lists of peaks by elevation, such as the New England 4000 Footers. For instance, only one peak in the Presidential Range is on this list because the others do not have a major prominence, being connected to Mount Washington by ridgelines that are nowhere below . Mount Washington has an elevation above sea level of but has a prominence of about because it stands that high above its key col — the lowest ground on the ridge line connecting Washington to the higher peaks of the southern Appalachian Mountains. Washington's key col is at the Champlain Canal in New York, the lowest ground on the water divide between the watersheds of the Hudson and Saint Lawrence Rivers.