Which term describes a narrow, steep-sided valley or ravine?

The term that accurately describes a narrow, steep-sided valley or ravine is "draw." In military and tactical contexts, a draw refers to such features in the terrain that can influence maneuvers and movement. Draws typically allow for the movement of troops or vehicles while providing some natural cover and concealment due to their steep sides. This geographical feature is significant in planning operations, as understanding the terrain can provide tactical advantages.

While canyon, gulley, and swale are related topographical terms, they do not specifically capture the characteristics of a narrow, steep-sided valley as effectively as draw does. A canyon usually indicates a larger and deeper valley, often formed by river erosion, while a gulley refers to a small, narrow channel caused primarily by water runoff. A swale, on the other hand, is a low or depressed area in the landscape, typically less steep. Therefore, "draw" is the term best suited to describe the specific features of a narrow and steep-sided ravine.