What terrain feature is a stretched out groove in the land, usually formed by streams and rivers?

A valley is characterized as a stretched out groove in the land that is typically formed through the erosion caused by running water such as streams and rivers. Throughout geological time, water flow carves out these low areas, resulting in the distinctive shape of a valley, which is generally flanked by higher ground like hills or mountains. Valleys provide essential drainage for water and can also be fertile areas for agriculture due to the sediment deposited by rivers.

The other terms refer to different terrain features: a hill is an elevated area that rises above the surrounding terrain, a cliff is a steep face of rock and earth, and a plateau is a flat, elevated area that has been uplifted from lower regions. None of these features describe the specific low-lying, elongated shape that defines valleys.