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Those circles are really interesting. I had no idea there were so many of them across Saudi Arabia. The aerial view makes them look almost too perfect to be natural, but I guess the explanation is probably much less mysterious once you look at the geology and how the land has been used.
I spend some time around industrial work through CS-Arabia, so I find these kinds of large scale patterns pretty interesting. Even something as technical as caliper pigging can reveal details that aren’t obvious at first glance.