Circles of trees

Google I somehow neighborhood Urals in Castle (eastern edge), that severe Chelyabinsk region and came across an interesting circle of trees.
What could it be?
I have several versions:
1. Warriors did something 30 years ago, commercials (do not know).
2. eccentricities local landscape designers (but why?).
3. Baikonur anunahov (the most realistic).

But right next to this place flows the famous radioactive Techa and then wandered Kyshtymsky Alexis ...





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