What are synonyms of deep ditches?

Here are some synonyms for "deep ditches," depending on the context:

General:

* Ravines

* Gullies

* Canyons (for very large ditches)

* Trenches (often used for military contexts)

* Valleys (for very wide and deep ditches)

* Channels

* Moats

* Chutes

* Crevasses (for very deep and narrow ditches)

More specific:

* Waterways (if the ditches are filled with water)

* Drainage ditches (if they're designed for draining water)

* Excavations (if they're man-made)

* Cuts (if they're created by cutting into the ground)

The best synonym will depend on the specific context of your writing. Consider the size, shape, and purpose of the ditch when choosing a synonym.