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.
Plain - A region of general uniform slope, comparatively level and of considerable extent; can refer to the
flat area of a large mesa (desert, grassland, highland, kula, plateau, savanna).
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