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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?
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).
This is what centuries old desire paths look like. Or it’s an old (non-standard?) railway.