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undesirable gravel
(lemmy.nz)
Desire paths Desire paths can be paths created as a consequence of erosion caused by human or animal foot-fall or traffic. The paths usually represent the shortest or most easily navigated routes between origins and destinations. https://en.wikipedia.org/wiki/Desire_path
I'm guessing there is a huge puddle or lots of mud blocking the main path after it rains.
i will take another photo on a rainy day/week