General Terms:
* Gully: This is a common term for a narrow ravine, especially one formed by erosion.
* Chasm: This term emphasizes the depth and steepness of the ravine.
* Cleft: This term emphasizes the narrowness and tightness of the ravine.
* Canyon: While canyons are typically wider and deeper, a very narrow canyon can be called a ravine.
More Specific Terms:
* Crevice: A narrow, deep crack or fissure in the earth's surface.
* Gorge: A deep, narrow valley with steep sides, often carved by a river.
* Knick: A sudden change in the slope of a riverbed, often forming a steep ravine.
* Hollow: A depression in the ground, often with a narrow, steep-sided entrance.
The best term to use will depend on the specific features of the ravine.
