Cleuch is a Scottish term that refers to a narrow, steep-sided valley or ravine, typically formed by a stream or river. Though it is a specific term, there are several synonyms that may be used interchangeably to describe a similar landscape. These include words like gorge, ravine, chasm, canyon, and defile. Each of these terms refers to a narrow passage or cut in the terrain that may be eroded by water or sculpted by geological processes. Other synonyms for cleuch might include cleft, fissure, or vale, depending on the exact nature of the feature, but each of these words relates to the same general concept of a sharp, narrow valley.