Which term refers to the terrain feature that indicates a dip in the land?

The term that refers to a terrain feature indicating a dip in the land is "depression." A depression is a low point in the landscape, which can be a natural formation such as a valley or sinkhole, characterized by its lower elevation compared to the surrounding area. This feature is essential for map reading and land navigation, as it helps in understanding the geography of an area.

In contrast, a spur refers to a lateral ridge or a projection that extends from a hill or mountain. A hill is an elevated area of land that rises prominently above its surroundings, while a cliff signifies a steep, vertical, or near-vertical face of rock or earth, which represents a drop rather than a dip. In summary, "depression" is the specific term used to describe a dip in the land, making it the correct choice in this context.