Topographic prominence

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In topography, prominence (also referred to as autonomous height, and shoulder drop in US English, and drop in British English) is the height of the summit of a mountain or hill relative to the lowest contour line encircling it, but containing no higher summit within it. It is a measure of the independence of a summit. The key col ("saddle") around the peak is a unique point on this lowest contour line. The parent peak (if any) is some higher mountain, selected according to various criteria.

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