A gulch is a deep V-shaped valley formed by erosion. It is usually larger in size than a gully and may contain a small stream or dry creek bed. Sudden intense rainfall upstream may produce flash floods in the bed of the gulch. In eastern Canada, the term "gulch" refers to a narrow deep cove in Newfoundland or a narrow saltwater channel in Nova Scotia. Other similar landforms include:
- Arroyo (creek): A dry watercourse with flow after rain.
- Canyon: A deep chasm between cliffs, including a gorge.
- Dale (landform): An open valley.
- Coulee: A type of valley or drainage zone.
- Gully: A landform created by running water and/or mass movement eroding sharply into soil.
- Ravine: A small valley, often due to stream erosion.
The term "gulch" is also defined as a deep or precipitous cleft or ravine, especially one occupied by a torrent.
