General terms:
* Canyon: This is the most common and broad term, especially in the western US. It implies a deep, steep-sided valley carved by a river, often with rocky walls.
* Ravine: This is a more general term for a deep, narrow valley, often with a stream or river at its bottom. It doesn't necessarily have to be rocky.
* Gully: This is a smaller, shallower ravine, often formed by erosion.
More specific terms:
* Arroyo: This is a Spanish word commonly used in the southwestern US for a dry watercourse that only carries water during heavy rains.
* Wash: This is another term for a dry watercourse, especially in the desert. It can also refer to a broad, shallow channel.
* Draw: This is a term often used in the Midwest and Great Plains for a dry ravine or valley.
Informal terms:
* Dry wash: This is a common term in the Southwest for an arroyo or wash that is currently dry.
* Dry creek: This is another informal term for a watercourse that is currently dry.
The best word to use will depend on the specific context and the size and shape of the feature.
