Historical Features are physical or cultural features that are no longer visible on the landscape. Examples: a dried up lake, a destroyed building, a hill leveled by mining. The term makes no reference to the age, use, or any other aspect of the feature. A ghost town, for example, is not a historical feature if it is still visible.
Ridge - Elevation with a narrow, elongated crest that can be part of a hill or mountain (arête, crest, chenier,
cuesta, divide, esker, hogback, mogote, lae, ridge, spur).