Looks like a fungal ring. Not something to worry too much about, but you might periodically have mushrooms spring up along the perimeter of the circle.
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Looks like a fungal ring. Not something to worry too much about, but you might periodically have mushrooms spring up along the perimeter of the circle.
I think you're 100% right. It's been rainy of late and this area gets mushroom activity. Digging and learning, it seems to be a "fairy ring" from mycelium growth in roots.