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How is this sort of thing formed?
People traveling through this area, riding on horse-drawn carriages over the course of several centuries.
This seems like an odd formation to occur naturally. Is it a trench?
This is what centuries old desire paths look like. Or it’s an old (non-standard?) railway.
It’s a “sunken lane” or “hollow way,” and it’s most likely caused by a few hundred years of very specific erosion (amusingly the lead image for the Wikipedia article for this phenomenon is the same as the post).