Which of the following is not considered a major terrain feature?

A cliff is typically not classified as a major terrain feature in military mapping and navigation. Major terrain features generally include hills, valleys, ridges, and depressions, as these elements have significant impacts on movements, positioning, and line-of-sight considerations for military operations.

Hills serve as high ground that can provide tactical advantages. Valleys are low areas that often serve as natural routes for movement but can also present challenges such as restricted visibility and vulnerability to enemy fire. Ridges are elongated elevations that can dictate the flow of troop movements and support positions.

In contrast, while cliffs can be prominent geographic features, they do not influence tactical maneuvers in the same systematic way as the other features listed. Cliffs may present challenges or hazards, but they do not encompass the same strategic utility that hills, valleys, and ridges provide to military operations. Thus, the focus on major terrain features typically revolves around elements that significantly affect the battlefield landscape and operational planning.