General terms:
* Gully: A small, narrow ravine, often formed by water erosion.
* Chasm: A deep, narrow gorge or ravine.
* Canyon: A deep, narrow valley with steep sides, often formed by a river.
* Cove: A small, sheltered valley or ravine, often near a coast.
* Ditch: A long, narrow trench dug in the ground, often used for drainage.
* Hollow: A low, sunken area of land, often with a ravine at the bottom.
* Valley: A low area of land between hills or mountains, often containing a ravine.
More descriptive terms:
* Gorge: A deep, narrow valley with steep sides, often formed by a river.
* Crevice: A narrow, deep crack or fissure in rock, often found in a ravine.
* Cleft: A narrow, deep opening in rock, often formed by a ravine.
* Gulch: A deep, narrow ravine, often with steep sides.
* Ravine: A deep, narrow valley or gorge, often formed by erosion.
Literary terms:
* Abyss: A deep, bottomless chasm or ravine, often used in a metaphorical sense.
* Precipice: A very steep, almost vertical cliff or rock face, often found at the edge of a ravine.
The best word to use will depend on the specific context. For example, if you are describing a small, shallow ravine, "gully" would be a good choice. But if you are describing a deep, narrow gorge, "canyon" or "gorge" would be more appropriate.